Fabien Cousteau is a French ocean explorer and documentary filmmaker．who spent his early years aboard his grandfather’s ships．Today, Fabien continues to protect the planet’s endangered ocean life and tries to strike a balance between environmental problems and market economies．
Fabien is well known for his study of sharks．During 2000—2002，he created a TV program aiming to change public ideas about sharks called“Attack of the Mystery Shark” based on the shark attacks that occurred along the New Jersey shoreline in the summer of 1916．Then during 2003—2006，with the help of a large crew，Fabien created a lifelike shark submarine(潜艇)，providing people with a rare view of the mysterious and often misunderstood creatures．
For the next four years(2006—2010)，Fabien was part of a series called“Ocean Adventures”，which provided viewers with a chance to look into some of the most fantastic ocean species(物种)and environments on the planet．
In 2010，Fabien started Plant A Fish，a nonprofit project for children to help rebuild local water ecosystems through the healthy“replanting”of key ocean species．Its final goal is to plant l billion“fish”worldwide in 10 years．
In June 2014，Fabien and his team embarked on Mission Mission 31，the longest underwater science research，the world’s only underwater laboratory located nine miles off the coast ot the Florida Keys，and 63 feet beneath the sea．Fabien’s Mission 31 broke new ground in ocean exploration，while broadcasting each moment live exposing the world to the adventure and mystique of what lies beneath．
Fabien is currently working on a feature documentary film about the adventures of Mission 31，as well as building all Ocean Learning Center to afford children around the world the opportunity to learn about oceans and connect with ocean explorers directly through social media．
1.How is the whole text developed?
A．By giving examples． B．By offering analyses．
C．By making comparisons． D．By arranging in time order．
2.For what purpose did Fabien explore the sea and created documentary films?
A．To make himself a world-famous filmmaker．
B．To show off his great determination and bravery．
C．To afford children the opportunity to learn about climate．
D．To raise the public’s awareness of environmental protection．
3.What does the underlined part“embarked on”in Paragraph 5 probably mean?
A．Set off on． B．Concluded from．
C．Were awarded for． D．Became famous for．
4.We can learn from the text that ___________．
A．Fabien’s“Plant A Fish”project has already achieved its final goal
B．Fabien’s Mission 31 broke the records of former ocean explorations
C．Fabien’s TV program about sharks is based on his childhood experiences
D．it took Fabien four years to produce“Ocean Adventures”on his own
高三英语阅读理解中等难度题
Fabien Cousteau is a French ocean explorer and documentary filmmaker．who spent his early years aboard his grandfather’s ships．Today, Fabien continues to protect the planet’s endangered ocean life and tries to strike a balance between environmental problems and market economies．
Fabien is well known for his study of sharks．During 2000—2002，he created a TV program aiming to change public ideas about sharks called“Attack of the Mystery Shark” based on the shark attacks that occurred along the New Jersey shoreline in the summer of 1916．Then during 2003—2006，with the help of a large crew，Fabien created a lifelike shark submarine(潜艇)，providing people with a rare view of the mysterious and often misunderstood creatures．
For the next four years(2006—2010)，Fabien was part of a series called“Ocean Adventures”，which provided viewers with a chance to look into some of the most fantastic ocean species(物种)and environments on the planet．
In 2010，Fabien started Plant A Fish，a nonprofit project for children to help rebuild local water ecosystems through the healthy“replanting”of key ocean species．Its final goal is to plant l billion“fish”worldwide in 10 years．
In June 2014，Fabien and his team embarked on Mission Mission 31，the longest underwater science research，the world’s only underwater laboratory located nine miles off the coast ot the Florida Keys，and 63 feet beneath the sea．Fabien’s Mission 31 broke new ground in ocean exploration，while broadcasting each moment live exposing the world to the adventure and mystique of what lies beneath．
Fabien is currently working on a feature documentary film about the adventures of Mission 31，as well as building all Ocean Learning Center to afford children around the world the opportunity to learn about oceans and connect with ocean explorers directly through social media．
1.How is the whole text developed?
A．By giving examples． B．By offering analyses．
C．By making comparisons． D．By arranging in time order．
2.For what purpose did Fabien explore the sea and created documentary films?
A．To make himself a world-famous filmmaker．
B．To show off his great determination and bravery．
C．To afford children the opportunity to learn about climate．
D．To raise the public’s awareness of environmental protection．
3.What does the underlined part“embarked on”in Paragraph 5 probably mean?
A．Set off on． B．Concluded from．
C．Were awarded for． D．Became famous for．
4.We can learn from the text that ___________．
A．Fabien’s“Plant A Fish”project has already achieved its final goal
B．Fabien’s Mission 31 broke the records of former ocean explorations
C．Fabien’s TV program about sharks is based on his childhood experiences
D．it took Fabien four years to produce“Ocean Adventures”on his own
高三英语阅读理解中等难度题查看答案及解析
Fabien Cousteau was born with deep love for the ocean. His grandfather and his father were ocean explorers and documentary filmmakers. Fabien spent his early years on his grandfather's ships. Today, Fabien follows in his family's footsteps to protect the planet's endangered ocean life. With his vast knowledge and experience, he tries to strike a balance between environmental problems and market economies.
Fabien is well known for his study of sharks. During 2000-2002, he created a TV special called Attack of the Mystery Shark based on the shark attacks that occurred along the New Jersey shoreline in the summer of 1916. Then in 2003-2006, with the help of a large crew, Fabien created a shark submarine (潜艇) that enabled him to put himself inside the shark world, providing people with a rare view of the mysterious and often misunderstood creatures.
For the next four years (2006-2010), Fabien was part of a series called, Ocean Adventures, which offered a rare look into some of the most fantastic ocean species (物种) and environments.
In 2010, Fabien started Plant A Fish, a nonprofit project for children to help restore local water ecosystems by replanting key ocean species. Save the world, one fish at a time. The project is still in progress now and its final goal is to plant 1 billion “fish” worldwide.
From June 1 to July 2, 2014, Fabien and his team spent 31 days underwater to research how climate change and pollution are affecting the oceans. Fabien's Mission 31 broke new ground by going deeper, longer and further, exposing (显露) the world to the adventure and the mystique (神秘) of what lies beneath.
Fabien is currently working on a documentary film about the adventures of Mission 31, as well as building an Ocean Learning Center to provide children around the world with the opportunity to learn about oceans and engage with ocean explorers directly through social media.
1.What is Not Fabien’s job?
A. Ocean explorer B. Documentary filmmaker
C. Environmentalist D. Media manager
2.How is Paragraph 2 developed?
A. By providing facts. B. By offering analyses.
C. By making comparisons. D. By drawing conclusions.
3.We can learn from the text that ________.
A. Fabien's “Plant A Fish” project has already achieved its final goal
B. Fabien's Mission 31 broke the records of former ocean explorations
C. Fabien's TV special about sharks is based on his childhood experiences
D. It took Fabien four years to produce Ocean Adventures all on his own
4.In which part of a website can we read the text?
A. Modern Technology. B. Space Exploration.
C. Outstanding Figures. D. Fantastic Wildlife.
高三英语阅读理解中等难度题查看答案及解析
阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
Fabien Cousteau was born with deep love for the ocean. His grandfather and his father were ocean _1.__ (explore) and documentary filmmakers. Today, Fabien follows his family’s footstep, trying __2.__ (protect) the planet’s endangered ocean life __3.__ to strike a balance between environmental problems and market economies.
Fabien is well known for his study of sharks. In 2001，he created a TV special based on the shark attacks that __4.__(occur) along the New Jersey shoreline in 1916. Then in 2003，__5.__ the help of a large crew，Fabien created a shark submarine that enabled him to put __6._(he) inside the shark world. For the next four years，Fabien was part of a series called Ocean Adventures, __7.__ offered a rare look into some of the most fantastic ocean species. In 2010, Fabien and his team spent 31 days underwater to discover __8.__ climate change and pollution which are affecting the oceans.
Fabien is __9.__(current) working on a documentary film about the adventures of Mission 31, as well as _10.__ (build) an Ocean Learning Center to provide children with the opportunity to learn about oceans.
高三英语语法填空中等难度题查看答案及解析
Jacques-Yves Cousteau, the French explorer, once pointed out, “Population growth is the primary source of environmental damage.” Many experts are calling the growing problem of global waste a worldwide health crisis in that pollution from trash is not only harming the world’s oceans, air and soil but also endangering people’s health as well as the livelihood of all living creatures.
Reduce, reuse, recycle
Such a dilemma raises the question, is there a more responsible way of dealing with trash? Fortunately, there is. Living a zero-waste lifestyle is the way to go. One example of this is what’s often called the three R’s: reduce, reuse, recycle. Reducing the use of plastic containers as well as reusing and recycling bottles and cans decreases the amount of garbage being sent to landfills. As a result, less money is spent on waste management, and countries’ financial burdens are significantly relieved. Such positive effects on an economy is known as a circular economy.
Circular economy
Traditionally, manufacturers would make a product to be used and disposed of by consumers. This linear model of production offered no help in the fight against global waste. Alternatively, a circular economy was introduced. Once a product’s value is exhausted, the materials are recycled and returned to manufacturers. The outcome is less waste. One large-scale example of this is happening on the island of Taiwan.
4-in-1 Recycling Program
In 1997, Taiwan established its signature 4-in-1 Recycling Program, consisting of communities, recycling companies, government cleaning teams and the Recycling Fund. Residents separate their recyclable waste. The local government collection teams collect it. Recycling companies buy waste materials from them to make profits. Importers and manufacturers who are responsible for the recyclable products pay a fee into the Recycling Fund. The Recycling Fund is an essential aspect of the program used to subsidize(补贴) the recycling disposal system, support education and research and development as well as finance recycling efforts in the future.
Turning garbage into gold
By following a circular system, more products than ever are being manufactured using recycled materials. Environmentally-friendly decisions like these help to conserve natural resources, reduce pollution, save landfill space and even create new job opportunities. Recycling can truly turn garbage into gold.
1.According to the passage, the biggest challenge facing the world today is________ .
A.the rapid growth of population B.the overdeveloped manufacture
C.the world’s large amount of trash D.inappropriate use of plastic products
2.What is the aim of bringing in circular economy?
A.To save land and create wealth.
B.To minimize waste and restore used materials.
C.To support research and speed development.
D.To rid poor habits and encourage a new lifestyle.
3.Which of the following might be the best title for the text?
A.Zero-Waste, Full Recycle B.Circular Economy In Action
C.The World’s Recycling Companies D.A Worldsize Environmental Crisis
高三英语阅读理解中等难度题查看答案及解析
The 90-minute documentary,Amazing China,is coproduced by China Central Television and China Film Corp.The film focuses on the major achievements the country has made since the 18th National Congress of the Communist Party of China in 2012.
Wei Tie,the director,says,"The film arouses Chinese pride from deep inside."
The documentary focuses on key Chinese projects in aerospace,high-speed rail,the Hong Kong-zhuhai-macao Bridge and the world's largest single-dish telescope FAST.
The documentary also tells viewers that seven of the world's 10 biggest sea ports are now in China.And the country now has the longest high-speed rail network in the world.
The film helps people to know our country better.The moving stories behind the Chinese wonders reflect the people's spirit of struggle.
A good documentary is usually a vivid impression of a single person's stories rather than slogans,and Amazing China is no exception.
One of the most touching moments in the film is from an interview of Nan Rendong,often called the"father of FAST".Sadly,after more than 20 years of working at the site,the chief scientist and engineer of the project passed away last year due to lung cancer.
The film is a salute to many other heroes like Nan Rendong,supporting the country's progress in science.Amazing China also focuses on common people.It shows that their work is not easy,but their spirit makes it possible to achieve their targets.And they are just representatives of the many Chinese who work hard.
China is the world's second-largest economy.The documentary is a good way for the country to build up self-confidence and to look to a brighter future.
1.According to Wei Tie,what does Amazing China do to Chinese?
A.It makes the people know more about the world's aerospace.
B.It stresses the major transportations of China in recent years.
C.It makes the people feel proud of the major achievements of China.
D.It shows to the people the production of Chinese scientists.
2.What's the function of Paragraph 7?
A.To introduce who Nan Rendong is.
B.To tell readers about the slogan of the film.
C.To make the sad news known to readers.
D.To give an example of a vivid image.
3.According to Amazing China,what's the impression of Chinese common people in the film?
A.They take easy work.
B.They work in high spirits.
C.They can tell moving stories.
D.They represent self-confident people.
4.What's the passage mainly about?
A.An amazing documentary.
B.Progress in science.
C.The bright future of high-speed rail.
D.The success of some engineers.
高三英语阅读理解中等难度题查看答案及解析
The BBC Documentary is divided into three categories: BBC Nature, BBC History and BBC Technology. For documentary lovers, it’s a great pleasure in life to enjoy the BBC Documentary with a wide range of subjects and excellent productions, whose super wonderful pictures are also a masterpiece of photography.
Nile 2004
The Nile, the longest river on the earth, spreads through jungles, and finally into the desert. Ancient Egyptians believed that the river had magic power. This documentary will uncover its mystery—a magnificent territory, which is full of rare animals and extends to the most desolate corners of Africa.
Hiroshima 2005
It was an important moment in the 20th century when an atomic bomb was launched into Hiroshima, Japan and it was also a scientific, technological, military and political adventure. This documentary, where we can see the Hiroshima street at the moment of disaster, tries to show us the real history and what life is like for the Japanese people who have experienced the atomic bombing.
Time Machine 2006
Some creatures have to make long-term evolutionary plans in order to survive, but can any creatures live forever? People shorten the growth period of rice regardless of the weather condition, and the modern transportation enables us to reach further areas at a faster speed. But can humans really turn around time? The time machine will introduce scientists' current research on a bug and find out the key to long life.
Super Volcano 2005
Yellowstone National Park, in fact, where the underground magma is ready to move, is one of the largest craters in the United States. With scientific evidence, reliable prediction and solid research by top geologists, the super volcano eruption is presented to the audience in a dramatic way.
1.If you are interested in history, which documentary will suit you well?
A.Nile B.Hiroshima
C.Time Machine D.Super Volcano
2.What can we learn from Time Machine?
A.People can turn around time by a time machine.
B.People have found a bug which can live a long life.
C.People now can travel faster and further in the world.
D.Rice now needs less time to grow according to the climate.
3.Which statement is TRUE according to the passage?
A.Hiroshima suffered from a disaster caused by atomic bombing.
B.The Nile spreads into the desert with magic power.
C.Yellowstone National Park is about to erupt.
D.The BBC Documentary is popular only because of its wide range of subjects.
高三英语阅读理解中等难度题查看答案及解析
“Free Solo” is a documentary beautifully calculated to literally take your breath away. And it does. The film’s subject, Alex Honnold, is the top-ranking climber of free soloing, the art of climbing dizzyingly steep rock faces with no ropes, no harnesses (安全带), just bare hands and dazzling determination and skill. “There’s no margin for error; you have to do it perfectly,” one climber explains, comparing the endeavor to an Olympic sport where “if you don’t get the gold medal you are going to die.”
“Free Solo” opens with a striking overhead shot, almost too exciting to watch, of Honnold at work, his hands finding narrow gaps that don’t seem to exist, pulling off seeing — is — not — believing moves that are more astonishing than the most ambitious special effect.
Directed by Elizabeth Chai Vasarhelyi and Jimmy Chin, “Free Solo” lets us in on how much went into the climb on a physical, psychological and emotional level, showing us how meticulously (细致地) even the tiniest move is planned. Vasarhelyi and Chin are the ideal people to tell this story, and not only because they’ve already done another superb mountaineering film, 2015’s “Meru”, which was short-listed for the best documentary Oscar. Chin has been an accomplished climber as well as a photographer and filmmaker, so he’s known Honnold for years and has the kind of friendship with the climber that makes the film possible.
Chin insisted his entire crew, including fellow cinematographers Clair Popkin and Mikey Schaefer, be experienced climbers, and one of the film’s most dramatic aspects is how nervous these extremely knowledgeable folks were about Honnold’s safety. The directors and crew worried that their presence might put too much pressure on Honnold or might lead to acts of what Chin characterizes as “Kodak courage”. More than that, no one wanted to be there shooting film if he made a mistake and died.
A perfectionist since Honnold was a boy, he found his gift for free solo early. One possible reason why Honnold is so good at it, which doctors hypothesized after giving him an MRI, is that his amygdala, the part of the brain that regulates fear, doesn’t react the way it does in most people. Though we inevitably worry about Honnold’ future safety, we’ve come to understand why his mother, Dierdre Wolownick, says that “climbing is when he feels the most alive. How can you take that away from somebody?” Seeing him at the peak of his skill on the biggest screen possible is an experience for everybody to savor (尽情享受).
1.What does it take to free solo?
A.Gift and good fortune.
B.Knowledge and experience.
C.Strength, determination and skill.
D.Ropes, harnesses, a photographer and a filmmaker.
2.Why are Vasarhelyi and Chin the ideal people to tell this story?
A.They’ve ever shot a superb mountaineering documentary.
B.They have rich experience and companionship with Honnold.
C.They were accomplished climbers, photographers and filmmakers.
D.They are physically, psychologically and emotionally well prepared.
3.Which of the following best describes Honnold as a climber?
A.Wild and daring.
B.Gifted and vain.
C.Demanding and particular.
D.Talented and perfectionistic.
4.What is the fourth paragraph mainly about?
A.“Kodak courage” is highly expected.
B.Too much pressure was put on Honnold.
C.Chin and his crew cared much about Honnold’s safety.
D.Chin took on knowledgeable folks to shoot the documentary.
高三英语阅读理解中等难度题查看答案及解析
Explorers started making navigation (导航) charts showing how wide the ocean was more than 500 years ago. But it’s much harder to calculate how deep it is.
In 1872 the HMS Challenger, a British Navy ship, set sail to learn about the ocean, including its depth. It carried 181 miles (291 kilometers) of rope to measure the depth of the ocean. During their four-year voyage, the Challenger crew collected samples of rocks, mud and animals from many different areas of the ocean. They also found one of the deepest zones, in the western Pacific, the Mariana Trench which stretches for 1,580 miles (2,540 kilometers).
Today scientists know that on average the ocean is 2.3 miles (3.7 kilometers) deep, but many parts are much shallower or deeper. To measure depth they use sonar, which stands for Sound Navigation And Ranging. A ship sends out pulses of sound energy and measures depth based on how quickly the sound travels back.
Ocean scientists like me study the sea floor because it helps us better measure the ocean. Our planet’s outer, layer is made of tectonic plates. The Hawaiian-Emperor Seamount chain, a line of peaks on the ocean floor, was created when a tectonic plate moved over a spot where hot rock welled up from deep inside the Earth. When two tectonic plates move away from each other underwater, new material rises up into Earths layer. This process, which creates new ocean floor, is called seafloor spreading. Sometimes super-hot liquids from inside the Earth shoot up through cracks in the ocean floor called hydrothermal vents.
Amazing fish, shellfish, tube worms and other life forms live in these zones. Between the creation and destruction of ocean plates, sediments (沉淀物) collect on the sea floor and provide an archive of Earth’s history, the evolution of climate and life that is available nowhere else.
1.Why did the HMS Challenger make the voyage?
A.To test navigation. B.To calculate the age of the ocean.
C.To explore the ocean. D.To do research into Mariana Trench.
2.How do scientists know the depth of the ocean?
A.By measuring it with ropes.
B.By studying samples of rocks and mud.
C.By analyzing the habitats of the animals.
D.By studying the returning speed of the sound.
3.What is the fourth paragraph mainly about?
A.Certain changes of the sea floor.
B.The layers that make up the Earth.
C.The way that a volcano comes into being.
D.Some definitions of the seafloor spreading.
4.What can be a suitable title for the text?
A.How Deep Is the Ocean? B.How Is the Ocean Studied?
C.Ocean: An Unknown World D.Nature: A Place for Wildlife
高三英语阅读理解简单题查看答案及解析
Win a trip to the OREGON COAST----- Dare to Explore the Pacific Ocean. Build the biggest sand castle on the beach. Search tide pools for sea life. Watch the bright orange sunset over the ocean. Whether you’ve been to the Pacific Ocean before or have only closed your eyes and imagined it, we want to know how you would explore the Oregon Coast if you had the chance to go this summer.
JUDGING
1. Clear relationship between the Essay and the Drawing 40%.
2. Creativity and skill in design and form of the Drawing 40%.
3. Expression of the passion to draw and explore 10%.
4. Journalistic quality, uncluttered(整洁的)nature and overall quality of the Essay 10%.
PRIZE
By entering, you will have the chance to win an all-expense paid trip to the OREGON COAST. Activities will include: Kite flying, studying beautiful sea creatures, searching for sea life on a boat, science exploration at a science center and roasting over a beach campfire.
Who may enter: The competition is open to kids aged 6-14.
TEAM: Entries must be postmarked no later than July 31, 2010.
How to enter
Surf traveloregon.com/kids to download and print out an entry form.
Be sure to mark whether you have to or have not been to the Pacific Ocean in the form. Create a drawing of the Pacific Ocean on a piece of paper using a pen or paints.
Write an article of 100 words or less to explain why you want to go, what you think you would see, and what you would explore if you have never been to the Pacific Ocean, or describe your favorite memories from your last visit.
Send to Dare to Explore the Pacific Ocean, NG1145 17th street NW, WashingtonD.C.20036.
1.
What is the most important for the judging?
| A．Whether your article is written in a neat way. |
| B．The article and the drawing should be closely related. |
| C．Whether you show your passion to draw and explore. |
| D．The skill in your drawing the map of the Atlantic Ocean. |
2.
If you win the competition, you may________.
| A．fly a kite on the beach |
| B．search the ocean for sea plants |
| C．build the biggest tower on the beach |
| D．roast the sea creatures over a beach campfire |
3.
What information can you get from the passage?
| A．Your article should be at least 100 words. |
| B．Every kid can take part in the competition. |
| C．You should mark the drawing with your name. |
| D．You must send the drawing before July 31, 2010. |
4.
You can most probably read the passage in_______.
| A．a textbook | B．a travel guide | C．a newspaper | D．a research book |
高三英语阅读理解简单题查看答案及解析
Robots are common in todays world. They manufacture cars, work in space, explore oceans, clean up oil spills and investigate dangerous environments. And now, scientists at the University of Manchester are using a robot as a laboratory partner.
The researchers at the university created the robot in 2009 and named it Adam. Despite the name, Adam is not a humanoid robot. It is about the size of a car.
Adam was built to do science and make discoveries. Ross King is the leader of the University of Manchester research team. He says the robot made a discovery about yeast（酵母）, a kind of fungus used in science as a model for human cells.
“Adam hypothesized certain functions of genes within yeast and experimentally tested these hypothesizes and confirmed them. So it both hypothesized and confirmed new scientific knowledge.”
Adam's success as a scientist led to the creation of another robot scientist named Eve. Researchers developed Eve to design and test drugs for tropical and neglected diseases. These diseases kill and infect millions of people each year.
Drug development is slow and costly. Experts say it can take more than 10 years and about $1 billion to discover and develop new medicines. Drug manufacturers are unlikely to get their investment money back.
So the University of Manchester developed a low-cost test that shows whether or not a chemical is likely to be made into an effective medicine. Mr. King says that other drug testing methods were not very effective.
“How it works conventionally is you use robotics(机器人技术) as well and you have a large collection of possible drugs. You test every single compound(复合物). And you start at the beginning of your library and continue until the end, and stop. So it’s not a very intelligent process. The robotics doesn’t learn anything as it goes along, even if its tested a million compounds, it still doesnt have any expectation of what will happen next when it tests a new compound.”
Mr. King says that Eve is different because the robot learns as it tests different compounds. He says the robot is designed to ignore compounds that it thinks unlikely to be good. It will only test the compounds which have a good chance of working.
Eve has discovered that a compound known to be effective against cancer might also be used to fight against malaria and other tropical diseases.
Mr. King says he hopes to completely automate the drug testing process with robots like Eve to create and test new chemicals. But he says humans remain in control of the manufacturing process.
1.Adam can do all the following EXCEPT ________.
A. making discoveries B. working in space
C. helping researchers D. doing scientific research
2.The underlined word “hypothesized” probably means ________.
A. learned B. guessed
C. discovered D. created
3.The development of new drugs is slow because ________.
a. It takes long to test new drugs.
b. It takes long to produce new drugs.
c. New drugs are less effective.
d. It takes long to profit from new drugs.
e. Conventional testing methods dont work well.
A. abc B. bcd C. cde D. ade
4.Eve has an advantage of ________.
A. testing a million compound at a time
B. controlling the manufacturing the process
C. expecting what will happen while testing drugs
D. making scientific research
5.What might be the best title for the passage?
A. Robot Scientist Helps Design New Drugs
B. Adam—the Smart Robot
C. New Methods to Test Drugs
D. Scientists Develop Humanoid Robots
高三英语阅读理解中等难度题查看答案及解析