WASHINGTON — President Obama and his wife, Michelle, handed out Halloween treats to area children and military families at the White House Sunday evening.
Local students between 6 and 14 years old, along with children from military families, were invited to celebrate Halloween on the North Lawn.
The president and first lady, along with Mrs.Obama's mother, Marian Robinson, spent about 30 minutes passing out goodie bags.Obama wished each child a happy Halloween as he distributed the treats, pausing occasionally for hugs or to comment on costumes.
Later, the military families continued the celebration inside the White House.
The first couple joked to assembled reporters about children walking the long driveway in order to work off (消化掉) the snacks."This is the Let's Move method of trick-or-treating (不给糖就捣蛋)," Obama said, referring to Mrs.Obama's campaign to combat childhood obesity (肥胖).
The goodie bags contained a box of White House M&Ms, a cookie made by pastry chef (点心师) Bill Yosses, and dried fruit.
As they made their way across the lawn, the children meet a vast range of costumed characters ranging from a spooky Frankenstein (科学怪人,小说《弗兰肯斯坦》的主角) to the Scarecrow from "The Wizard of Oz." Music from a jazz band dressed in pirate gear rang out across the White House grounds.
Multicolored pumpkins and gourds lined the driveway — individually, in gravity-defying stacks and as part of a large mound over 5 feet tall.Pumpkin-headed scarecrows (稻草人) made of cornstalks loomed over the path with menacingly raised arms.Under the White House portico, a mobile resembling bats flying through clouds fluttered around a lantern.
Some of the local trick-or-treaters were students at Bancroft Elementary, which helps tend the first lady's White House garden, and Tubman Elementary, which has a relationship with the White House chefs.
After trick-or-treating ended, the Obamas stood near the front door, welcoming the military families inside, helping children climb the short flight of steps and thanking parents for their service.
1.What is the news report mainly about?
A.President Obama and first lady celebrated Halloween with children. |
B.President Obama and his wife Michelle handed out Halloween treats to children. |
C.Children from military families were invited to celebrate Halloween at the White House. |
D.Trick-or-treaters met a vast range of costumed characters from Frankenstein to the Scarecrow. |
2.From the passage, we know that ______ do not necessarily appear when people celebrate Halloween.
A.Goodie bags |
B.Pumpkins and Gourds |
C.White House M&Ms |
D.Costumed characters |
3.When celebrating Halloween at the White House, the Obamas did the following EXCEPT______.
A.Wishing each child a happy Halloween |
B.Thanking reporters for their covering the event |
C.Helping children climb the short flight of steps |
D.Hugging children and commenting on their costumes |
4.The passage is mainly developed by ______.
A.analyzing causes | B.making comparisons |
C.examining differences | D.following the time order |
高三英语阅读理解中等难度题
WASHINGTON — President Obama and his wife, Michelle, handed out Halloween treats to area children and military families at the White House Sunday evening.
Local students between 6 and 14 years old, along with children from military families, were invited to celebrate Halloween on the North Lawn.
The president and first lady, along with Mrs.Obama's mother, Marian Robinson, spent about 30 minutes passing out goodie bags.Obama wished each child a happy Halloween as he distributed the treats, pausing occasionally for hugs or to comment on costumes.
Later, the military families continued the celebration inside the White House.
The first couple joked to assembled reporters about children walking the long driveway in order to work off (消化掉) the snacks."This is the Let's Move method of trick-or-treating (不给糖就捣蛋)," Obama said, referring to Mrs.Obama's campaign to combat childhood obesity (肥胖).
The goodie bags contained a box of White House M&Ms, a cookie made by pastry chef (点心师) Bill Yosses, and dried fruit.
As they made their way across the lawn, the children meet a vast range of costumed characters ranging from a spooky Frankenstein (科学怪人,小说《弗兰肯斯坦》的主角) to the Scarecrow from "The Wizard of Oz." Music from a jazz band dressed in pirate gear rang out across the White House grounds.
Multicolored pumpkins and gourds lined the driveway — individually, in gravity-defying stacks and as part of a large mound over 5 feet tall.Pumpkin-headed scarecrows (稻草人) made of cornstalks loomed over the path with menacingly raised arms.Under the White House portico, a mobile resembling bats flying through clouds fluttered around a lantern.
Some of the local trick-or-treaters were students at Bancroft Elementary, which helps tend the first lady's White House garden, and Tubman Elementary, which has a relationship with the White House chefs.
After trick-or-treating ended, the Obamas stood near the front door, welcoming the military families inside, helping children climb the short flight of steps and thanking parents for their service.
1.What is the news report mainly about?
A.President Obama and first lady celebrated Halloween with children. |
B.President Obama and his wife Michelle handed out Halloween treats to children. |
C.Children from military families were invited to celebrate Halloween at the White House. |
D.Trick-or-treaters met a vast range of costumed characters from Frankenstein to the Scarecrow. |
2.From the passage, we know that ______ do not necessarily appear when people celebrate Halloween.
A.Goodie bags |
B.Pumpkins and Gourds |
C.White House M&Ms |
D.Costumed characters |
3.When celebrating Halloween at the White House, the Obamas did the following EXCEPT______.
A.Wishing each child a happy Halloween |
B.Thanking reporters for their covering the event |
C.Helping children climb the short flight of steps |
D.Hugging children and commenting on their costumes |
4.The passage is mainly developed by ______.
A.analyzing causes | B.making comparisons |
C.examining differences | D.following the time order |
高三英语阅读理解中等难度题查看答案及解析
Many Americans take their summer vacations in August. President Obama and his family are among them. This August the first family visited the Florida Gulf Coast. The president wants to promote tourism in the area after the BP oil spill (漏油). The first family took a ten-day vacation on Martha’s Vineyard, an island off the coast of Massachusetts.
Martha’s Vineyard is known for the sailing, sunsets and its tall cliffs overlooking the Atlantic Ocean. The island is about 13 kilometers off the coast and is less than 260 square kilometers. Homes designed like those of earlier times line the streets of Edgartown, Oak Bluffs and Vineyard Haven. These are the major towns on Martha’s Vineyard.
For most of the year, the population of Martha’s Vineyard is about 15 000. In summer, more than 100 000 people crowd the island. In addition to the Obamas, you might see some Hollywood stars and other rich and famous people. Many visitors return year after year.
During warm weather the Vineyard is a good place for many different activities. People can play golf or catch fish. They can ride in sailboats or motor boats. They can waterski and swim. They can take quiet walks along sandy beaches and among the thick green trees.
One of the popular places for families with children is the Flying Horses Carousel in Oak Bluffs. It is the oldest continually operated merry-go-round ride in the United States. The colorful wood horses that turn in a circle were created in 1876. One of the best places for children to swim is the Joseph A. Sylvia state beach. The water there is warmer and calmer. Families also enjoy the Felix Neck Wildlife Sanctuary where they can observe much of the island wildlife.
Visitors watch the sunsets sitting on the beach and on rocks in the fishing village of Menemsha. As the sun goes down in the sky it paints yellow, red, and other colors on the clouds. Fishing boats rise and fall with the waves. Bells sound to help guide the boats to land as darkness covers the water.
Historians say British mapmaker Bartholomew Gosnold first made a map of the island for the rulers of England in 1602. Gosnold named the island to honor his baby daughter, Martha. The Vineyard part of the name came from the many wild grape vines Gosnold found on the island. Later, King Charles of England gave the island to businessman Thomas Mayhew of the Massachusetts Bay Colony, whose son established the first European settlement on the island in 1642. By the middle of the nineteenth century, ships from the American mainland began bringing visitors to the island. Big hotels were built near the edge of the water. Martha’s Vineyard was on its way to becoming the visitors center that it is today.
1..
We can infer that ______.
A. the BP oil spill has a negative effect on the tourism along the Florida Gulf Coast
B. the BP oil spill has contributed to the tourism along the Florida Gulf Coast
C. President Obama went to the Florida Gulf Coast to deal with the BP oil spill
D. this was the first time that President Obama and his family had taken the vacation on Martha’s Vineyard
2..
Which month is the peak time for tourism in Martha’s Vineyard?
A. January. B. August. C. December. D. March,
3..
If children want to see wild animals, the family should go to ______.
A. the Flying Horses Carousel B. the Sylvia state beach
C. the fishing village of Menemsha D. the Felix Neck Wildlife Sanctuary
4..
Bartholomew Gosnold named the island Martha in honor of _______.
A. his mother B. the king of England
C. his daughter D. his father
高三英语阅读理解困难题查看答案及解析
WASHINGTON, Sept. 6 (Xinhua) -- U.S. President Barack Obama on Monday announced a new
plan to renew and expand the nation's roads, railways and runways, in a bid (努力) to restart the sluggish economy and to help create jobs.
Obama announced the billion-dollar infrastructure(基础设施) spending program at an event in Milwaukee, Wisconsin, marking the Labor Day holiday in the United States.
The proposal calls for investments over six years, including rebuilding and modernizing 150,000 miles (241,350 kilometers) of roads, 4,000 miles (6,430 kilometers) of railways and 150 miles ( 241 kilometers) of runways.
"It sets up an Infrastructure Bank to leverage(杠杆;利用) federal dollars and focus on the smartest investment. All of this will not only create jobs now, but will make our economy run better over the long haul," Obama said.
"This is a plan that will be fully paid for and will not add to the deficit over time," said Obama.
The U.S. unemployment rate rose to 9.6 percent in August, reflecting business reluctance to hire among uncertain economic prospects, the U.S. Labor Department reported on Friday.
The president admitted that new jobs "have not been coming fast enough" in the United States.
"These years would be some of the most difficult in our history. The problems facing working families are nothing new, but they are more serious than ever. And that makes our cause more urgent than ever," he added.
1.What does the underlined word “sluggish” probably mean?
A.繁荣的 | B.崩溃的 | C.疲软的 | D.行动迅速的 |
2.What’s the main idea of this passage?
A.The US president launched a new program aiming at improving the nation’s infrastructure. |
B.The US unemployment rate rose according to the Labor Department. |
C.These years will be the most difficult in the American history. |
D.More roads, railways and runways will be rebuilt and modernized. |
3.Which of the following will be changed most in length?
A.Roads. | B.Railways. | C.Runways. | D.Highways. |
高三英语阅读理解中等难度题查看答案及解析
WASHINGTON, Sept. 6 (Xinhua) -- U.S. President Barack Obama on Monday announced a new plan to renew and expand the nation's roads, railways and runways, in a bid (努力) to restart the sluggish economy and to help create jobs.
Obama announced the billion-dollar infrastructure(基础设施) spending program at an event in Milwaukee, Wisconsin, marking the Labor Day holiday in the United States.
The proposal calls for investments over six years, including rebuilding and modernizing 150,000 miles (241,350 kilometers) of roads, 4,000 miles (6,430 kilometers) of railways and 150 miles ( 241 kilometers) of runways.
"It sets up an Infrastructure Bank to leverage(杠杆;利用) federal dollars and focus on the smartest investment. All of this will not only create jobs now, but will make our economy run better over the long haul," Obama said.
"This is a plan that will be fully paid for and will not add to the deficit over time," said Obama.
The U.S. unemployment rate rose to 9.6 percent in August, reflecting business reluctance to hire among uncertain economic prospects, the U.S. Labor Department reported on Friday.
The president admitted that new jobs "have not been coming fast enough" in the United States.
"These years would be some of the most difficult in our history. The problems facing working families are nothing new, but they are more serious than ever. And that makes our cause more urgent than ever," he added.
1.What does the underlined word “sluggish” probably mean?
A. 繁荣的 B. 崩溃的 C. 疲软的 D. 行动迅速的
2.What’s the main idea of this passage?
A. The US president launched a new program aiming at improving the nation’s infrastructure.
B. The US unemployment rate rose according to the Labor Department.
C. These years will be the most difficult in the American history.
D. More roads, railways and runways will be rebuilt and modernized.
3.Which of the following will be changed most in length?
A. Roads. B. Railways. C. Runways. D. Highways.
高三英语阅读理解简单题查看答案及解析
WASHINGTON – Barack Obama swept to victory as the first black president in the US history Tuesday night in an electoral college landslide that overcame racial barriers as old as America itself. "Change has come," he told a huge group of cheering supporters.
In his first speech as victor, Obama catalogued the challenges ahead. "The greatest of a lifetime," he said, "two wars, a planet in danger, the worst financial crisis in a century."
He added, "There are many who won't agree with every decision or policy I make as president, and we know that government can't solve every problem. But I will always be honest with you about the challenges we face."
The son of a black father from Kenya and a white mother from Kansas, the Democratic senator from Illinois sealed his historic triumph by defeating Republican Sen. John McCain in a string of wins in hard-fought battleground states -- Ohio, Florida, Virginia, Iowa and more.
In his speech, Obama invoked (引用) the words of Lincoln and echoed John F. Kennedy.
"So let us summon a new spirit of patriotism, of service and responsibility where each of us resolves to pitch in (努力投入) and work harder," he said.
He and his running mate, Joseph Biden of Delaware, will take their oaths(宣誓)of office as president and vice president on Jan. 20, 2009.
Obama will move into the Oval Office as leader of a country that is almost certainly in recession (不景气), and fighting two long wars, one in Iraq, the other in Afghanistan.
Obama has said his first order of presidential business will be to tackle the economy. He has also pledged to withdraw most US combat troops from Iraq within 16 months.
1.What is special about Barack Obama, the newly-elected president of the United States?
A. He has a black father and a white mother.
B. He is the first black president in the US history.
C. He defeated Republican Sen. John McCain easily.
D. He will move into the White Palace on Jan. 20, 2009.
2.What Obama emphasized in his first speech were ________.
A. dangers B. wars C. challenges D. financial problems
3.The first issue Obama will focus his attention on may probably be to ________.
A. withdraw most US combat troops from Iraq B. care for environmental protection
C. declare two wars in Iraq and Afghanistan D. deal with the problems of economy
4.According to the passage, Obama’s attitude toward the challenges he faces is ________.
A. positive B. negative C. ambiguous D. worried
高三英语阅读理解中等难度题查看答案及解析
WASHINGTON, Sept.6 (Xinhua) -- U.S.President Barack Obama on Monday announced a new plan to renew and expand the nation's roads, railways and runways, in a bid (努力) to restart the sluggish economy and to help create jobs.
Obama announced the billion-dollar infrastructure(基础设施) spending program at an event in Milwaukee, Wisconsin, marking the Labor Day holiday in the United States.
The proposal calls for investments over six years, including rebuilding and modernizing 150,000 miles (241,350 kilometers) of roads, 4,000 miles (6,430 kilometers) of railways and 150 miles ( 241 kilometers) of runways.
"It sets up an Infrastructure Bank to leverage(杠杆;利用) federal dollars and focus on the smartest investment.All of this will not only create jobs now, but will make our economy run better over the long haul," Obama said.
"This is a plan that will be fully paid for and will not add to the deficit over time," said Obama.
The U.S.unemployment rate rose to 9.6 percent in August, reflecting business reluctance to hire among uncertain economic prospects, the U.S.Labor Department reported on Friday.
The president admitted that new jobs "have not been coming fast enough" in the United States.
"These years would be some of the most difficult in our history.The problems facing working families are nothing new, but they are more serious than ever.And that makes our cause more urgent than ever," he added.
1.What does the underlined word “sluggish” probably mean?
A.繁荣的 B.崩溃的 C.疲软的 D.行动迅速的
2.What’s the main idea of this passage?
A.The US president launched a new program aiming at improving the nation’s infrastructure.
B.The US unemployment rate rose according to the Labor Department.
C.These years will be the most difficult in the American history.
D.More roads, railways and runways will be rebuilt and modernized.
3.Which of the following will be changed most in length?
A.Roads. B.Railways.
C.Runways. D.Highways.
高三英语阅读理解中等难度题查看答案及解析
WASHINGTON—US President Barack Obama said Thursday that he had known about NBA star Jeremy Lin’s talent long before the“Linsanity”phenomenon swept the sport.
“I knew about Jeremy before you did because Arne Duncan, my secretary of education, was captain of the Harvard team,”Obama told the famous US sportswriter Bill Simmons in an interview.
“When Arne and I were playing, he said,‘I’m telling you, we’ve got this terrific guard named Jeremy Lin at Harvard.’And then when one of my best friends, whose son is a freshman at Harvard, went for a recruiting(招募) trip he saw Lin in action, so I’ve been on the Jeremy Lin bandwagon(时尚) for a while,”said the president, who is a Harvard Law graduate.
Lin, the New York Knicks’ point guard, though he was cut twice in December 2011, had had a sudden rise in the past month to high points scoring stardom in Madison Square Garden, the world’s biggest basketball stage.
He is the first Chinese-American player in the NBA. He has already developed a devoted following among many Asian-Americans and in China, Taiwan, the Philippines and other countries.
Clicks to the NYKnicks. Com website surged as basketball fans from around the world search for Lin’s news and highlights.
“He seems like a wonderful young man. It elevates(提升) this great sport all round the world,”said Obama, a Chicago Bulls fan.“And what’s been encouraging is to see how fast the sport has bounced back(恢复) recently.”But he sounded a note of caution on how much basketball costs to watch.
“It’s really important for professional athletes and sports owners to just remember you got a whole bunch of folks out here, all across the country, who invest so much in their teams. All they ask is not to be so selfish that you’re not looking out for your fans,”Obama said.
1.President Obama learned about Jeremy long before through________.
A.news reports | B.a friend | C.Bill Simmons | D.Arne Duncan |
2.The underlined word“surged”in Paragraph 6 probably means________.
A.moved suddenly and quickly | B.stopped gradually |
C.moved slowly | D.suddenly broke down |
3.President Obama finds it encouraging that________.
A.Chicago Bulls is playing wonderfully |
B.Jeremy Lin is becoming more popular |
C.NBA matches have returned to normal |
D.audience is concerned about basketball |
4.Both athletes and sports owners should care about folks because________.
A.they have made contributions to charities |
B.all teams are in need of support from fans |
C.they pay to watch their favorite teams play |
D.they can decide the result of a game |
高三英语阅读理解中等难度题查看答案及解析
Despite being tall, Michelle Obama is much smaller than she appears on television. And she seemed a little short by her surroundings in the great hall of Christchurch College as she spoke quietly without a microphone because of a technical mistake. Her audience were 40 young girls from a London state school where 50 languages are spoken.
“I remember how well-meaning but misguided people questioned whether someone with my background could succeed at an elite (精英) university,” she said. “When I was accepted, I had all kinds of worries and doubts. I wouldn’t be as well prepared as students from privileged families and I wouldn’t fit in. But you are just as capable and have just as much to offer as anyone else.”
This was Mrs. Obama’s only solo outing during the state visit and part two of an unusual relationship which she has struck up with Anderson College in Islington. Two years ago on her first visit to the UK she visited the school.
Yesterday she returned to meet the pupils but this time at Christchurch College where they were taking part in an open day run to improve Oxford’s still poor record on diversifying student intake.
Mrs. Obama was asked why she married her husband, what it was like being First Lady and when there would be a female President in the White House. Her message—which she repeated time and again—was work hard, have self-belief, and don’t be afraid to fail. It was very un-British, but rather effective. Afterwards there were hugs for everyone and a photo with her.
And watching the group of multicultural young Britons surround her among the splendor of the college building one thought stood out. Had Mrs. Obama been born in Britain, she would almost certainly not have made it to Oxford as she did to Harvard. But now—thanks in part to her—some of these children just might.
1.According to the passage, Michelle Obama ____________.
A. graduated from Anderson College
B. paid her first visit to the UK this time
C. was confident when she entered the college
D. came from a family without good background
2.It is implied in the passage that these 40 young girls ____________.
A. were all from the United States
B. were students of Oxford University
C. came from different cultural backgrounds
D. stayed with Mrs. Obama because of hard work
3.Michelle Obama thinks success may come from the following EXCEPT ____________.
A. working hard B. believing in yourself
C. good opportunities D. facing failure without fear
4.What can we learn from the underlined sentence?
A. The British pupils couldn’t understand her message.
B. Her message reached the British pupils successfully.
C. Repetition is not the British way to give a message.
D. All effective messages are not conveyed in British.
高三英语阅读理解中等难度题查看答案及解析
Despite being tall, Michelle Obama is much smaller than she appears on television. And she seemed a little short by her surroundings in the great hall of Christchurch College as she spoke quietly without a microphone because of a technical mistake. Her audience were 40 young girls from a London state school where 50 languages are spoken.
“I remember how well-meaning but misguided people questioned whether someone with my background could succeed at an elite (精英) university,” she said. “When I was accepted, I had all kinds of worries and doubts. I wouldn’t be as well prepared as students from privileged families and I wouldn’t fit in. But you are just as capable and have just as much to offer as anyone else.”
This was Mrs. Obama’s only solo outing during the state visit and part two of an unusual relationship which she has struck up with Anderson College in Islington. Two years ago on her first visit to the UK she visited the school.
Yesterday she returned to meet the pupils but this time at Christchurch College where they were taking part in an open day run to improve Oxford’s still poor record on diversifying student intake.
Mrs. Obama was asked why she married her husband, what it was like being First Lady and when there would be a female President in the White House. Her message—which she repeated time and again—was work hard, have self-belief, and don’t be afraid to fail. It was very un-British, but rather effective. Afterwards there were hugs for everyone and a photo with her.
And watching the group of multicultural young Britons surround her among the splendor of the college building one thought stood out. Had Mrs. Obama been born in Britain, she would almost certainly not have made it to Oxford as she did to Harvard. But now—thanks in part to her—some of these children just might.
1.According to the passage, Michelle Obama ____________.
A. graduated from Anderson College
B. paid her first visit to the UK this time
C. was confident when she entered the college
D. came from a family without good background
2.It is implied in the passage that these 40 young girls ____________.
A. were all from the United States
B. were students of Oxford University
C. came from different cultural backgrounds
D. stayed with Mrs. Obama because of hard work
3.Michelle Obama thinks success may come from the following EXCEPT ____________.
A. working hard B. believing in yourself
C. good opportunities D. facing failure without fear
4.What can we learn from the underlined sentence?
A. The British pupils couldn’t understand her message.
B. Her message reached the British pupils successfully.
C. Repetition is not the British way to give a message.
D. All effective messages are not conveyed in British.
高三英语阅读理解中等难度题查看答案及解析
Michelle Obama, Kate Moss and Samantha Cameron are three of the most stylish﹙时髦的﹚ women on the planet because they have their daughters rather than their style. A new research has shown that women with daughters tend to be more stylish than mothers of sons; a fact partly because of the style advice their daughters offer as they get older.
78 percent of women over the age of 50 say they would be more than happy to let their daughters choose a complete outfit﹙全套衣装﹚ for them. However, just five percent of women say they would turn to their sons for style advice, while 28 percent believe that mothers of boys are less fashionable than women with girls.
“Women who don’t have daughters become less interested in style as they grow older but having a daughter may keep alive her interest in looking great,” comments psychologist Honey Langcaster-James. “And, because of their close relationship, they also have a source of support and encouragement when it comes to their style decisions.”
More than a quarter of women believe that Mums who have sons are less fashion-conscious than Mums with daughters. The most common reasons for this are that daughters are more critical, offer good advice and inspiration, and add an element of competition to look the best while sons don’t seem to care and aren’t as strict as daughters.
Interestingly, although mothers tend to rely on their daughters’ style tips, their confidence isn’t reciprocated﹙互换﹚, with 40 percent of women between the age of 19 and 34 saying they wouldn’t allow their mothers to shop for them as what their mothers would choose for them would not be as good as they expected.
And although they might not appreciate the fashion advice, the research, which was conducted by online retailer Gray & Osbourn, showed that daughters do still need their mothers with 71 percent saying they chat to their female parent every day.
“In short, the research shows just how important relationships are between mothers and daughters,” added Langcaster-James, “and just how much women appreciate an honest and trustworthy opinion.”
1.The opening paragraph is mainly to show .
A. girls influence their mothers’ style decision
B. women with children are often less stylish
C. mothers like to follow their children’s advice
D. boys are actually better advisors than girls
2.Which of the following may Langcaster-James agree with?
A. Daughters usually love their mothers more than sons do.
B. It’s hard for boys to get along well with their mothers.
C. Mothers without daughters show less interest in style.
D. Girls are more independent than boys in some ways.
3.It can be inferred from the passage that girls .
A. show more interest in science than boys.
B. care more about what their mothers wear
C. can help a lot to solve family problems
D. are good at encouraging other people
4.By saying “their confidence isn’t reciprocated” in Paragraph 5, the author means that .
A. some women don’t like to choose clothes for their mothers
B. some women aren’t sure what to wear when attending a party
C. some women often show no confidence in themselves
D. some women would not like to follow their mothers’ style advice
5.What does the author mainly tell us in the passage?
A. It confuses many parents how to talk with their kids.
B. Daughters prefer to talk with their mums instead of dads.
C. It is important for parents to respect their children’s choice.
D. Mothers of girls are more fashionable than those of boys
高三英语阅读理解中等难度题查看答案及解析