More than four decades ago, British scientist Robert Edwards first witnessed the miracle of human life growing inside a test tube at his Cambridge lab. Since that ground－breaking moment, more than four million babies have been born through IVF(体外受精) and in 2010 his great contribution to science was finally recognized as he was awarded the Nobel Prize for Medicine.
The prize for Dr. Edwards, who was given a Daily Mirror Pride of Britain Award in 2008, includes a ￡900，000 cheque. The Nobel Assembly described IVF as “a milestone in modern medicine”.
With the help of fellow scientist Patrick Steptoe, the Manchester－born physiologist developed IVF — leading to the birth of the world's first test tube baby. Dr. Steptoe died 10 years later but their work has transformed fertility(生育) treatment and given hope to millions of couples.
It was a scientific breakthrough that changed the lives of millions of couples. They said, “His achievements have made it possible to treat infertility, a disease which makes humans unable to have a baby. This condition has been afflicting a large percentage of mankind, including more than 10% of all couples worldwide.”
Professor Edwards, who has 5 daughters and 11 grandchildren, began his research at Cambridge University in 1963, after receiving his PhD in 1955.He once said, “The most important thing in life is having a child. Nothing is more special than a child.” With the help of fellow scientist Patrick Steptoe, Prof. Edwards founded the Bourn Hall clinic in Cambridgeshire, which now treats more than 900 women a year. Each year, more than 30, 000 women in Britain now undergo IVF and 11，000 babies are born as a result of the treatment.
But his work attracted widespread criticism from some scientists and the Catholic Church who said it was “unethical and immoral”.
Martin Johnson, professor of reproductive(生殖的) sciences at the University of Cambridge, said the award was “long overdue”. He said, “We couldn't understand why the Nobel has come so late but he is delighted — this is the cherry on the cake for him.”
Professor Edwards was too ill to give interviews but a statement released by his family said he was “thrilled and delighted”.
1.What is Robert Edwards' contribution to science?
A. Challenging a disease which stops couples having a baby.
B. Seeing the wonder of the first tube baby growing.
C. Enabling millions of couples to live a better life.
D. Helping couples with infertility to have test tube babies.
2.What does the underlined word “afflicting” in Paragraph 4 most probably refer to?
A. Troubling. B. Developing.
C. Improving. D. Frightening.
3.It can be inferred from Paragraph 6 and Paragraph 7 that ________.
A. some people envied Professor Edwards for his being awarded
B. different opinions were voiced on Professor Edwards' work
C. Professor Edwards deserved the prize for his breakthrough
D. the prize was late because the finding was first considered immoral
4.What might be the best title for the passage?
A. Life Stories of Robert Edwards
B. Preparations for Having a Baby
C. Nobel Prize for IVF Expert Edwards
D. Treatment of Infertility in a Lab
高二英语阅读理解中等难度题
More than four decades ago British scientist Robert Edwards first witnessed the miracle of human life growing inside a test tube at his Cambridge lab. Since that ground-breaking moment, more than four million babies have been born through IVF and in 2010 his great contribution to science was finally recognized as he was awarded the Nobel Prize for medicine.
The prize for Dr. Edwards, who was given a Daily Mirror Pride of Britain Award in 2008, includes a £900,000 check. The Nobel Assembly described IVF as a “milestone in modern medicine”.
With the help of fellow scientist Patrick Steptoe, the Manchester-born physiologist developed IVF - leading to the birth of the world’s first test tube baby. Dr. Steptoe died 10 years later but their work has transformed fertility treatment and given hope to millions of couples.
It was a scientific breakthrough that transformed the lives of millions of couples. They said: “His achievements have made it possible to treat infertility, a disease which makes human unable to have a baby. This disease has been afflicting a large percentage of mankind including more than 10% of all couples worldwide.”
Louise Brown, the world’s first test tube baby, made international headlines when she was born in Oldham, Manchester, in 1978 to parents Lesley and John who had been fruitlessly trying for a baby since 1969.
IVF-----in-vitro fertilization is the process whereby egg cells are fertilized outside the body before being implanted in the womb. After a cycle of IVF, the probability of a couple with infertility problems having a baby is one in five—the same as healthy couples who conceive naturally.
Professor Edwards, who has five daughters and 11 grandchildren, began his research at Cambridge University in 1963, after receiving his PhD in 1955. He once said: “The most important thing in life is having a child. Nothing is more special than a child.” With the help of fellow scientist Patrick Steptoe, Prof. Edwards founded the Bourn Hall clinic in Cambridge shire, which now treats more than 900 women a year. Each year, more than 30,000 women in Britain now undergo IVF and 11,000 babies are born as a result of the treatment.
But his work attracted widespread criticism from some scientists and the Catholic Church who said it was “unethical and immoral”.
Martin Johnson, professor of reproductive sciences at the University of Cambridge, said the award was “long overdue”. He said: “We couldn’t understand why the Nobel has come so late but he is delighted - this is the cherry on the cake for him.”
Professor Edwards was too ill to give interviews but a statement released by his family said he was “thrilled and delighted”.
1.What is Robert Edwards’ contribution to science?
A. Enabling millions of couples to live a better life.
B. Seeing the wonder of the first tube baby growing
C. Helping couples with infertility to have tube babies.
D. Challenging a disease which stops human having a baby.
2.What does the underlined word “afflicting”(Paragraph 4)most probably refer to?
A. Troubling B. Developing
C. Improving D. Confusing
3.Why did Professor Edwards begin his research on tube baby?
A. Because he thought it of great significance to have a child in life.
B. Because the birthrate around the world was unexpectedly low then.
C. Because a special child did make a difference to an ordinary family.
D. Because his fellow scientist wanted to give hope to the unlucky couples.
4.It can be inferred from Paragraph 8 and Paragraph 9 that ___________.
A. Professor Edwards deserved the prize for his breakthrough.
B. different opinions were voiced on Professor Edwards’ achievement.
C. some people envied Professor Edwards for his being awarded.
D. the prize was late because the finding was first considered immoral.
5.What might be the best title for the passage?
A. Life Stories of Robert Edwards
B. Preparations for Having a Baby
C. Nobel Prize for IVF Expert Edwards
D. Treatment of Infertility in a Lab
高二英语阅读理解中等难度题查看答案及解析
More than four decades ago, British scientist Robert Edwards first witnessed the miracle of human life growing inside a test tube at his Cambridge lab. Since that ground－breaking moment, more than four million babies have been born through IVF(体外受精) and in 2010 his great contribution to science was finally recognized as he was awarded the Nobel Prize for Medicine.
The prize for Dr. Edwards, who was given a Daily Mirror Pride of Britain Award in 2008, includes a ￡900，000 cheque. The Nobel Assembly described IVF as “a milestone in modern medicine”.
With the help of fellow scientist Patrick Steptoe, the Manchester－born physiologist developed IVF — leading to the birth of the world's first test tube baby. Dr. Steptoe died 10 years later but their work has transformed fertility(生育) treatment and given hope to millions of couples.
It was a scientific breakthrough that changed the lives of millions of couples. They said, “His achievements have made it possible to treat infertility, a disease which makes humans unable to have a baby. This condition has been afflicting a large percentage of mankind, including more than 10% of all couples worldwide.”
Professor Edwards, who has 5 daughters and 11 grandchildren, began his research at Cambridge University in 1963, after receiving his PhD in 1955.He once said, “The most important thing in life is having a child. Nothing is more special than a child.” With the help of fellow scientist Patrick Steptoe, Prof. Edwards founded the Bourn Hall clinic in Cambridgeshire, which now treats more than 900 women a year. Each year, more than 30, 000 women in Britain now undergo IVF and 11，000 babies are born as a result of the treatment.
But his work attracted widespread criticism from some scientists and the Catholic Church who said it was “unethical and immoral”.
Martin Johnson, professor of reproductive(生殖的) sciences at the University of Cambridge, said the award was “long overdue”. He said, “We couldn't understand why the Nobel has come so late but he is delighted — this is the cherry on the cake for him.”
Professor Edwards was too ill to give interviews but a statement released by his family said he was “thrilled and delighted”.
1.What is Robert Edwards' contribution to science?
A. Challenging a disease which stops couples having a baby.
B. Seeing the wonder of the first tube baby growing.
C. Enabling millions of couples to live a better life.
D. Helping couples with infertility to have test tube babies.
2.What does the underlined word “afflicting” in Paragraph 4 most probably refer to?
A. Troubling. B. Developing.
C. Improving. D. Frightening.
3.It can be inferred from Paragraph 6 and Paragraph 7 that ________.
A. some people envied Professor Edwards for his being awarded
B. different opinions were voiced on Professor Edwards' work
C. Professor Edwards deserved the prize for his breakthrough
D. the prize was late because the finding was first considered immoral
4.What might be the best title for the passage?
A. Life Stories of Robert Edwards
B. Preparations for Having a Baby
C. Nobel Prize for IVF Expert Edwards
D. Treatment of Infertility in a Lab
高二英语阅读理解中等难度题查看答案及解析
More than four decades ago British scientist Robert Edwards first witnessed the miracle of human life growing inside a test tube at his Cambridge lab. Since that ground-breaking moment, more than four million babies have been born through IVF and in 2010 his great contribution to science was finally recognized as he was awarded the Nobel Prize for medicine.
The prize for Dr. Edwards, who was given a Daily Mirror Pride of Britain Award in 2008, includes a £900,000 check. The Nobel Assembly described IVF as a “milestone in modern medicine”.
With the help of fellow scientist Patrick Steptoe, the Manchester-born physiologist developed IVF - leading to the birth of the world’s first test tube baby. Dr. Steptoe died 10 years later but their work has transformed fertility treatment and given hope to millions of couples.
It was a scientific breakthrough that transformed the lives of millions of couples. They said: “His achievements have made it possible to treat infertility, a disease which makes human unable to have a baby. This condition has been afflicting a large percentage of mankind including more than 10% of all couples worldwide.”
Louise Brown, the world’s first test tube baby, made international headlines when she was born in Oldham, Gtr Manchester, in 1978 to parents Lesley and John who had been fruitlessly trying for a baby since 1969.
Ivf-in-vitro fertilization is the process whereby egg cells are fertilized outside the body before being implanted in the womb. After a cycle of IVF, the probability of a couple with infertility problems having a baby is one in five—the same as healthy couples who conceive naturally.
Professor Edwards, who has five daughters and 11 grandchildren, began his research at Cambridge University in 1963, after receiving his PhD in 1955. He once said: “The most important thing in life is having a child. Nothing is more special than a child.” With the help of fellow scientist Patrick Steptoe, Prof. Edwards founded the Bourn Hall clinic in Cambridge shire, which now treats more than 900 women a year. Each year, more than 30,000 women in Britain now undergo IVF and 11,000 babies are born as a result of the treatment.
But his work attracted widespread criticism from some scientists and the Catholic Church who said it was “unethical and immoral”.
Martin Johnson, professor of reproductive sciences at the University of Cambridge, said the award was “long overdue”. He said: “We couldn’t understand why the Nobel has come so late but he is delighted - this is the cherry on the cake for him.”
Professor Edwards was too ill to give interviews but a statement released by his family said he was “thrilled and delighted”.
1.What is Robert Edwards’ contribution to science?
A. Enabling millions of couples to live a better life.
B. Seeing the wonder of the first tube baby growing
C. Helping couples with infertility to have tube babies.
D. Challenging a disease which stops human having a baby.
2.What does the underlined word “afflicting”(Paragraph 4)most probably refer to?
A. Troubling B. Developing
C. Improving D. Confusing
3.Why did Professor Edwards begin his research on tube baby?
A. Because he thought it of great significance to have a child in life.
B. Because the birthrate around the world was unexpectedly low then.
C. Because a special child did make a difference to an ordinary family.
D. Because his fellow scientist wanted to give hope to the unlucky couples.
4.It can be inferred from Paragraph 8 and Paragraph 9 that ___________.
A. Professor Edwards deserved the prize for his breakthrough.
B. different opinions were voiced on Professor Edwards’ finding.
C. some people envied Professor Edwards for his being awarded.
D. the prize was late because the finding was first considered immoral.
5.What might be the best title for the passage?
A. Life Stories of Robert Edwards
B. Preparations for Having a Baby
C. Nobel Prize for IVF Expert Edwards
D. Treatment of Infertility in a Lab
高二英语阅读理解中等难度题查看答案及解析
More than four decades ago British scientist Robert Edwards first witnessed the miracle of human life growing inside a test tube at his Cambridge lab. Since that ground-breaking moment, more than four million babies have been born through IVF and in 2010 his great contribution to science was finally recognized as he was awarded the Nobel Prize for medicine.
The prize for Dr. Edwards, who was given a Daily Mirror Pride of Britain Award in 2008, includes a £900,000 check. The Nobel Assembly described IVF as a “milestone in modern medicine”.
With the help of fellow scientist Patrick Steptoe, the Manchester-born physiologist developed IVF — leading to the birth of the world’s first test tube baby. Dr. Steptoe died 10 years later but their work has transformed fertility treatment and given hope to millions of couples.
It was a scientific breakthrough that transformed the lives of millions of couples. They said: “His achievements have made it possible to treat infertility, a disease which makes human unable to have a baby. This condition has been afflicting a large percentage of mankind including more than 10% of all couples worldwide.”
Louise Brown, the world’s first test tube baby, made international headlines when she was born in Oldham, Gtr Manchester, in 1978 to parents Lesley and John who had been fruitlessly trying for a baby since 1969.
Ivf-in-vitro fertilization is the process whereby egg cells are fertilized outside the body before being implanted in the womb. After a cycle of IVF, the probability of a couple with infertility problems having a baby is one in five—the same as healthy couples who conceive naturally.
Professor Edwards, who has five daughters and 11 grandchildren, began his research at Cambridge University in 1963, after receiving his PhD in 1955. He once said: “The most important thing in life is having a child. Nothing is more special than a child.” With the help of fellow scientist Patrick Steptoe, Prof. Edwards founded the Bourn Hall clinic in Cambridge shire, which now treats more than 900 women a year. Each year, more than 30,000 women in Britain now undergo IVF and 11,000 babies are born as a result of the treatment.
But his work attracted widespread criticism from some scientists and the Catholic Church who said it was “unethical and immoral”.
Martin Johnson, professor of reproductive sciences at the University of Cambridge, said the award was “long overdue”. He said: “We couldn’t understand why the Nobel has come so late but he is delighted — this is the cherry on the cake for him.”
Professor Edwards was too ill to give interviews but a statement released by his family said he was “thrilled and delighted”.
1.What is Robert Edwards’ contribution to science?
A. Enabling millions of couples to live a better life.
B. Helping couples with infertility to have tube babies.
C. Seeing the wonder of the first tube baby growing
D. Challenging a disease which stops human having a baby.
2.Why did Professor Edwards begin his research on tube baby?
A. Because a special child did make a difference to an ordinary family.
B. Because the birthrate around the world was unexpectedly low then.
C. Because he thought it of great significance to have a child in life.
D. Because his fellow scientist wanted to give hope to the unlucky couples.
3.It can be inferred from Paragraph 8 and Paragraph 9 that ________.
A. Professor Edwards deserved the prize for his breakthrough
B. different opinions were voiced on Professor Edwards’ finding
C. some people envied Professor Edwards for his being awarded
D. the prize was late because the finding was first considered immoral
4.What might be the best title for the passage?
A. Life Stories of Robert Edwards
B. Preparations for Having a Baby
C. Nobel Prize for IVF Expert Edwards
D. Treatment of Infertility in a Lab
高二英语阅读理解中等难度题查看答案及解析
More than two hundred years ago the United States _______ from the British Empire and became an independent country.
| A．broke down | B．broke out | C．broke away | D．broke off |
高二英语单项填空简单题查看答案及解析
More than two hundred years ago the United States _______ from the British Empire and became an independent country.
A. broke down B. broke out C. broke away D. broke off
高二英语单项填空中等难度题查看答案及解析
WHAT’S the most important thing of life?
People’s answers vary greatly. For British scientist Robert Edwards，the answer is having a child.“Nothing is more special than a child，”he told the BBC.
Edwards，the inventor of the In Vitro Fertilization(IVF)technology—more commonly known as“testtube(试管)baby”technology—passed away on April 10 ,2013 at the age of 87.
Edwards changed the lives of millions of ordinary people who now rejoice(充满喜悦)in the gift of their own child，”said Peter Braude，professor at King’s College London.“He leaves the world a much better place.”
Edwards started his experiments as early as the 1950s，when he had just finished his PhD in genetics. At that time，much of the public viewed test-tube babies as“scary”，according to Mark Sauer，professor at Columbia University，US.
Edwards and his colleague Patrick Steptoe faced opposition from churches，governments and media，not to mention attacks from many of their fellow scientists.“People said that we should not play God and we should not interfere with nature，”Edwards once told Times. He said that he felt “quite alone” at the time.
“But Edwards was a fighter，and he believed in what he was doing，”said Sauer. Without support from the government，the two struggled to raise funds to carry on. And in 1968 they finally developed a method to successfully fertilize human eggs outside the body.
The first test-tube baby was born on July 25，1978.Her name was Louise Brown. Despite people’s safety concerns，Brown was just as healthy as other children.
“IVF had moved from vision to reality and a new era in medicine had begun，”BBC commented.
Ever since then，public opinion has evolved considerably. Couples who were unable to have babies began thronging(蜂拥)to Edwards’ clinic. Nowadays，Reuters reports，some 4.3 million other“test-tube” children exist. Edwards received a Nobel Prize in 2010 and was knighted(封为爵士)by Queen Elizabeth Ⅱ the following year.
Before his death，Edwards was still in touch with Louise.“He is like a granddad to me，”she said in an interview with the Daily Mail.
He is a granddad to millions, in fact.
1.What is the article mainly about?
A．The first test-tube baby.
B．A new era in medicine.
C．The inventor of IVF technology.
D．The changes IVF technology has brought.
2.The writer quoted Peter Braude to ________．
A．show how difficult it was for Edwards to do his work
B．describe what kind of person Edwards was
C．explain why he is loved by all children
D．comment on his achievement
3.The underlined word“opposition”in Paragraph 6 is closest in meaning to ________．
A．attack B．support
C．test D．influence
4.What is the CORRECT order of events in Edwards’ life?
a．He received a Nobel Prize.
b．He struggled to raise funds.
c．The first test-tube baby was born.
d．He was knighted by Queen Elizabeth Ⅱ.
e．He succeeded in fertilizing human eggs outside the body.
f．He started his experiments on IVF technology.
A．f—e—b—c—a—d B．f—b—e—c—d—a
C．f—b—e—c—a—d D．f—e—d—a—c—b
高二英语阅读理解中等难度题查看答案及解析
Four decades ago a group of college students visited the mountains of Borneo to examine moth (蛾) populations. Now a team of British scientists, including a member of the original trip, has returned to the same sites to repeat the survey. They have found that, due to rising temperatures, the insects now live 68 meters higher.
Global warming is forcing tropical (热带的) species uphill to escape the rising temperatures at a rate of nearly 2 meters a year, the new study from Borneo suggests.
Since this was the only chance to repeat the original survey, the scientist did everything they could to do it exactly the same way, going at the same time of year, in July and August, using photographs to find the exact original sites of the moth traps.
"While this is the first study of insects, a few other studies of tropical species are starting to appear," said Thomas. "If you look across all those studies, you’ll find the same results, and it’s extremely difficult to think of any other explanation for them."
While some species might survive by finding places on the mountains with temperatures similar to those of their original habitats, others may run out of habitat on the rocky peaks, warns the study.
In a paper in the journal Naturein 2004, Thomas and 13 other experts analyzed the habitats of 1,100 species on five continents, and estimated that on average one quarter were at risk of extinction.
Last year a paper published in the Public Library of Science in the US warned that the risk of extinction in the tropics was becoming more and more serious. The authors, Jana and Steven Vamosi, estimated that 20-45% of tropical species were at risk of extinction.
1.If the temperature continues to rise at the same rate for ten years, the insects will live about ______.
A．6.8 meters higher B．19 meters higher
C．34 meters higher D．68 meters higher
2.What’s the problem for some species moving up mountains?
A．There’ll be too little space.
B．The temperature will be much too low.
C．They will be at greater risk of extinction.
D．They’ll find it hard to adapt to the environment.
3.We can learn from the passage that ______.
A．this survey of moths has been carried out many times
B．some scientists have put forward other explanations for the results
C．scientists tried to repeat the original survey
D．20-45% of tropical species were estimated to be at risk of extinction in 2004
4.Which of the following has been mainly discussed in the passage?
A．Climate change forcing moths higher.
B．Protecting moths from extinction.
C．How to research tropical moths.
D．How to study moths living on mountains.
高二英语阅读理解中等难度题查看答案及解析
It happened one morning 20 years ago. A British scientist Alec Jeffrey came across DNA fingerprinting: He identified the patterns of genetic material that are unique to almost every individual. His discovery changed everything from the way we do criminal investigations to the way we decide family law. But the professor of genetics at the University of Leicester, UK, is still surprised, and a bit worried, by the power of the technology he released upon the world.
The patterns within DNA are unique to each individual, except identical twins, who share the same pattern. The ability to identify these patterns has been used to convict(证明…有罪) murderers and to clear people who are wrongly accused. It is also used to identify the victims of war and settle disputes over who is the father of a child.
Jeffrey said he and his colleagues made the discovery by accident while tracking genetic variations(变异). But, within six months of the discovery, genetic fingerprinting had been used in an immigration case, to prove that an African boy really was his parents’ son.·In 1986, it was used for the first time in a British criminal case: It cleared one suspect after being accused of two murders and helped convict another man.
DNA testing is now very common. In Britain, a national criminal database established in 1995 now contains 2.5 million DNA samples. The U.S. and Canada are developing similar systems. But there are fears about the stored DNA samples and how they could be used to harm a person’s privacy. That includes a person’s medical history, racial origin or psychological profile. “There is the long-term risk that people can get into these samples and start getting additional information about a person’s paternity(父子关系) or risk of disease,” Jeffrey said.
DNA testing is not an unfailing proof of identity. Still, it is considered a reasonably reliable system for determining the things it is used for. Jeffrey estimates the probability of two individuals’ DNA profiles matching in the most commonly used tests at one in a billion.
1.According to the text, DNA testing can NOT be used in _______ .
A. doing criminal investigations B. deciding faraily law
C. clearmg wrongly accused people D. telling twins apart
2.DNA samples are not popular with all the people because _______ .
A. the government in Britain establishes a criminal database
B. the US and Canada develop similar systems
C. DNA samples can be used to harm a person’s privacy
D. DNA testing is too expensive and dangerous now
3.Where will you most probably find this article?
A. In a guidebook. B. In a storybook.
C. In a science fiction. D. In a scientific magazine.
4.Which is the best title for the passage?
A. Discovery of DNA testing by Jeffery B. Practice of DNA testing in court
C. DNA testing in the present situation D.Benefits and side effects of DNA testing
高二英语阅读理解中等难度题查看答案及解析
Although the size of the overall new vehicle market is larger than it was a decade ago, the size of Canada's midsize car market has been fallen to half. With figures in October, 2019 from Global Automakers of Canada look at their current state.
Ford Fusion: 7 280 sales, up 16 percent
Fusion sales reduced 15 percent in 2015, 9 percent in 2016,33 percent in 2017 and 27 percent in 2018. As Ford clears out the departing Fusion in 2019, sales are rising. Between the Fusion's 20 145-unit peak in2013 and 2018, the former best-seller took a 65-percent dive.
Toyota Camry: 11 579 sales, up 4 percent
When the Camry took over from the Ford Fusion as Canada's top-selling midsize car in 2012, the Camry's market share was little more than half as strong as it is now. Yet while Toyota sold 18 203 Camrys that year (far from the 28 218 that were sold five years earlier). Toyota will find 15 000 buyers in 2019, with a little help from the daily rental market.
Honda Accord: 9 089 sales, down 13 percent
The Accord is, by modern standards, a popular midsize car. But this 10th-generation car is a far cry from the Accord that led the market with 25 814 sales in 2004. Honda is not likely to sell half so many Accords in Canada in 2019, although the car's market share has grown from the 13 percent it held in 2010
Chevrolet Malibu: 4 674 sales, down 14 percent
The Malibu had continuous improvements in 2013, 2014, 2015 and 2016. But after reporting 11 503 Malibu sales in 2016, GM Canada sold 29 per cent fewer in 2017 and then posted an 18-percent Malibu drop in 2018. Demand is weakening further in 2019.
1.Which car has the biggest rate of change in 2019?
A.Ford Fusion. B.Toyota Camry.
C.Honda Accord. D.Chevrolet Malibu.
2.What helps Toyota Camry sell the most cars?
A.Its strong structure. B.Its popular midsize.
C.The most market share. D.The flexible market policy.
3.What do the four cars have in common?
A.Sales are not optimistic in 2019. B.Sales trends are not what they used to be.
C.New generations will improve car sales. D.These data are from all over the world.
高二英语阅读理解简单题查看答案及解析