The United States government wants to know what the public thinks about its finding on the safety of cloned animals.

The Food and Drug Administration says meat and milk from clones of adult animals are safe to eat. They called them “as safe to eat as the food we eat every day.” And when those clones reproduce sexually(有性繁殖), the agency says, their offspring(后代)are safe to eat as well.

The United States this year could become the first country to allow the sale of foods from cloned animals. First，however，the public will have ninety days to comment on three proposed documents. On December 28th the F.D.A. released a long report, called a draft risk assessment, along with two policy documents. The agency says it must receive comments by April 2nd. The F.D.A. seemed ready to act several years ago，but an advisory committee called for more research.

For now，the government will continue to ask producers to honor a request that they do not sell foods from cloned animals.

Clones are still rare. They cost a lot and are difficult to produce. The F.D.A. says most food from cloning is expected to come not from clones themselves, but from their sexually reproduced offspring. It says clones are expected to be used mostly as breeding animals to spread good qualities.

Public opinion studies show most Americans do not like the idea of food from cloned animals. But this research also shows the public know little about cloning. Cloning differs from genetic engineering. A cell taken from a so­called donor animal is grown into an embryo(胚胎)in the laboratory. Next, the embryo is placed into the uterus(子宮)of a female animal. If the process is successful, the pregnancy reaches its full term and a genetic copy of the donor animal is born.

1. From the passage, we know ________.

A. the US government is very cautious about the safety of cloned foods

B. foods from cloned animals are popular in America

C. cloned animals will be easy to produce

D. most foods from cloning are expected to come from clones themselves

2.Who believes that foods from cloning are safe to eat?

A. Most Americans. B. An advisory committee.

C. Critics. D. The F.D.A. .

3. It can be inferred from the last paragraph that _______.

A. cloning has much in common with genetic engineering

B. not every cell taken from a donor animal can grow into a genetic copy

C. the donor animal should be a female one

D. cloned animals grow faster than normal ones

4. Whether the sale of cloned foods is allowed in the US depends on ________.

A. cloning technology

B. the advisory committee’s research

C. public comments

D. the documents of the F.D.A.

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：2015-2016學(xué)年湖南岳陽一中高一上學(xué)期期中英語試卷（解析版） 題型：閱讀理解

Printing images is easy. Just select an image of a purple robot on your PC, for example, and press print. Your home printer exactly shoots drops of ink onto a flat piece of paper, creating the robot’s 2-D image. “Printing” 3-D objects is different. Take the purple robot. First select a file of the 3-D printer. Immediately, the printer begins making noise, and a nozzle (噴嘴) releases plastic material in thin layers. In two or three hours, a 3-D purple robot is standing before you.

3-D printing has developed to the point where printers can now create high-quality objects using a variety of materials, including metals. That means 3-D printers can now make final products that meet high industrial standards. 3-D printers are already being used to make parts for racecars and jets as well as man-made limbs and hearing aids.

So far, few homes have 3-D printers. That’s because 3-D printing is not only new to most people but also quite expensive. To bring 3-D printing to the masses, some retail stores (零售商店) plan to offer the service. For example, the Staples chain of office supply stores has announced that it will offer 3-D printing in Europe beginning in 2013. Customers will be able to submit their own 3-D designs to Staples website for printing. After the job is done, they’ll pick up their item at a nearby Staples store or have it mailed to their homes. This service is sure to encourage many more people to try out 3-D printing.

1.According to this article, who are 3-D printed parts already helping?

A. People with physical disabilities.

B. People in the solar energy field

C. People who lack suitable housing

D. People in need of computer skills

2.What will customers need in order to submit their designs to Staples?

A. A credit card account

B. Its local phone number

C. Professional experience

D. Access to the Internet

3.What does the writer of this article imply about 3-D printing?

A. Its inventor is famous

B. Its future looks bright.

C. It is still quite cheap.

D. It will be of little use.

4.What do we learn about the 3-D purple robot?

A. How long it can usually last

B. How it can darken its own color

C. How it gradually takes shape

D. How much it costs to produce

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年福建師大附中高一上學(xué)期期末英語試卷（解析版） 題型：單項填空

Mum pretended ________ what happened yesterday at school, but in fact, she has been told about every detail.

A．not to hear about

B．not to have heard about

C．not to be hearing about

D．to not hear about

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年山西忻州第一中學(xué)高二上學(xué)期期末英語試卷（解析版） 題型：七選五

根據(jù)短文內(nèi)容，從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。

Reducing the amount of sleep affects students’ performance at school. An American study asked schoolteachers to look at the effects of sleep restriction（限制） on children between six and twelve years of age. The teachers found that children who stayed up late had trouble thinking clearly and had more learning problems.

1. Doctor Fallone now works at the Forest Institute of Professional Psychology in Springfield, Missouri. He presented the results last month at a science reporter conference in Washington, D. C. The Publication Sleep also reported the findings.

The teachers were asked to complete weekly performance reports on seventy-four schoolchildren. The study lasted three weeks. During that period, Doctor Fallone and his team controlled the amount of sleep the children received.

2. During another week, every child was kept awake later than normal. Each night, the youngest boys and girls had less than eight hours of sleep. The older ones were limited to six and a half hours. During the final week of the study, each child received no less than ten hours of sleep a night.

The teachers were not told about how much sleep the students received. The study found that students who received eight hours or less had the most difficulty remembering old information. 33.

The study did not find that sleep restriction caused hyperactivity(極度活躍) in the children. 4.

Doctor Fallone said that the results provided experts and parents with a clear message: 5.

A. The sleeping time that the students have can be changed easily.

B. They also had trouble learning new information, completing difficult work and following directions.

C. During one week, the children went to bed and awoke at their usual time.

D. The teacher should restrict the amount of sleep of the students.

E. Gahan Fallone did the study at the Brown Medical School and Bradley Hospital in the state of Rhode Island.

F. The teachers reported that students were, in fact, a little less active at school when they got less sleep.

G. When a child has learning problems, the issue of sleep must be considered among the possible causes.

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年山西大同第一中學(xué)高二上學(xué)期期末英語試卷（解析版） 題型：閱讀理解

One night Mrs. Riley, an elderly woman, was walking along a dark London street. She was carrying her handbag in one hand and a plastic carrier bag in the other. There was nobody else in the street except two young men. They were standing in a dark shop doorway. One of them was very tall with fair hair, the other was short and fat with a beard.

The two young men waited for a few moments, and then ran quickly and quietly towards Mrs. Riley. The tall one held her from behind while the other one tried to seize her handbag.

Suddenly Mrs. Riley threw the tall one over her shoulder. He crashed into the other one and they both landed on the ground. Without speaking, Mrs. Riley struck both of them on the head with her handbag and walked calmly away.

The two surprised young men were still sitting on the ground when Mrs. Riley crossed the street towards a door with a lighted sign above it. Mrs. Riley paused, turned round, smiled at them and walked into the South West London Judo Club.

1.The two young men were standing in a dark shop doorway because .

A. they had nothing to do

B. they were homeless

C. they were waiting for a victim

D. they were guarding the shop

2.How did the story end?

A. The woman was robbed of her handbag.

B. The woman taught the two young men a lesson.

C. The woman reported the two young men to the police.

D. The woman sent the two young men to a judo club.

3.The story tells about an elderly woman who .

A. went shopping at night

B. was on her way home

C. had just left a shopping center

D. had a skill of self-defense

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年湖北武漢二中高一上學(xué)期期末英語試卷（解析版） 題型：閱讀理解

When NASA astronaut Scott Kelly completes his yearlong mission on the International Space Station next year, he’ll come back just a little bit younger than his twin, Mark, than he was before. This is because time travels more slowly in space, a phenomenon first described by Albert Einstein’s 1915 theory of general relativity.

This December, universities and academies around the world are celebrating the 100th anniversary of the theory’s publication.

Even 60 years after his death, Einstein is still the most important scientist of the modern era. Looking back as far as 2,400 years ago, only Newton, Galileo and Aristotle were his equals.

Born in the era of horse-drawn carriages, his ideas started a technological revolution that brought about more change in one century than in the 2,000 years before.

In 1905, Einstein published four important scientific papers. These completely changed people’s ideas about space, time, light and matter. In one of these papers Einstein. introduced his theory of special relativity. Two groundbreaking parts of the theory were about the relationship between mass and energy and the speed of light. Einstein was able to show that mass and energy were connected through the formula E＝MC2. The theory also says that no object can travel faster than the speed of light.

About 10 years later came his theory of general relativity, the theory that modern physics is really based on. In Einstein’s mathematics, space has three dimensions, and the fourth dimension is time. Space and time are part of one continuum, called space-time. The presence of mass changes space-time, which explains where gravity comes from.

Computers, satellites, telecommunication, lasers, television and nuclear power, many of the biggest developments in the modern world, can be linked to Einstein’s work.

“We are a different people than we were a century ago,” said astrophysicist Michael Shara of the American Museum of Natural. History, “completely different, because of Einstein.”

However, there’s more to him beyond the image of a science mastermind. Einstein, as a person, has also become a grandfatherly icon in our culture.

He liked playing Mozart on his Violin and keeping fit by hiking and walking. Power was not his goal. In 1952, the young nation of Israel asked Einstein to be its president, but he refused.

And, yes, he was eccentric. With hair like that, how could he not be?

1.The first paragraph was written to .

A. get readers to wonder about the effects of space travel on astronauts’ health

B. interest readers in the relationship between time and space

C. describe what gave Einstein the inspiration for his theories

D. lead in to the topic of the theory of general relativity

2.From the article, it can be concluded that .

A. the theory of general relativity is mainly about space and time

B. the theory of general relativity proves that the speed of light is the fastest of all speeds

C. the theory of general relativity is about math and has nothing to do with physics

D. the most important parts of the theory of special relativity are about space and energy

3.By using Michael Shara’s words, the author intends to .

A. give high praise to Einstein’s important publications

B. stress the great contribution that Einstein made to the modern world

C. suggest that more research needs to be done into Einstein and his work

D. say that there was more to Einstein than just being a science genius

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年寧夏回族自治區(qū)銀川一中高一上期末英語卷（解析版） 題型：閱讀理解

My son ,Izzy, was a nine-year-old boy and had been begging me to please let him find his way home by subway, by himself. After all, we live in New York City, and getting around by public transportation is a basic part of life. It is also the first step toward feeling grown-up. So on that sunny Sunday，I gave him a subway map, a transportation card,$20 for emergencies, and a couple of coins so that he could call me if necessary. I didn’t give him a cell phone because nine-year-olds lose things. A few days later, I wrote about his adventure，or non-adventure for a newspaper. Little did I realize the idea that a kid could tour the city on his own, and that a mom would let him, was big news.

It turned out that many TV shows called me and asked for an interview. Bloggers were going crazy, so I started a blog, too, and letters came pouring in. Finally I found out why this was such a big story: we have become fearful for our children. Fear is hardly a new thing for parents, of course. But the fear of letting our children out of sight for even a second-that’s new. How did this happen? How did it become too scary to let kids be kids? I asked the question when the reporter Trevor Butterworth interviewed me.

“News reports,” he answered. “News reports scare the pants off you. What is scarier than a kidnapped(綁架) kid no matter how far away？Because there are so many such stories, it starts to feel as if kidnappings are happening all the time. That’s why the kid-on-the-subway story surprises the whole world.”

Izzy probably did a good job. He simply proved that kids could leave home alone and return home safely! But he didn’t think it was a big deal. “It was fun,” he said. “But I missed some classes because of the interviews.” Sometimes it really pays to be brave.

1.Why did the author let her son take the subway alone?

A. Because she always let her son do whatever he wanted.

B. Because she believed that her son had memorized the subway map.

C. Because she thought it would be big news around the whole world.

D. Because she felt traveling by subway in New York was a basic life skill.

2.The author gave her son all the following when he traveled alone EXCEPT_______.

A. a map. B. a cell phone.

C. a transportation card D. some money.

3.The author didn’t expect that after she wrote her son’s story for a newspaper, __________.

A. a blog would be started in her name

B. her son would receive so many letters

C. many TV shows would want to interview her

D. many TV stations would want to film her son’s story

查看答案和解析>>

科目：高中英語 來源：2016屆貴州遵義航天高級中學(xué)高三上學(xué)期三次模擬英語試卷（解析版） 題型：閱讀理解

Most of us have quite good memories, but our memories are limited. For example, we cannot remember everyone we have ever met or what we did on every single day of our lives. However, there are some people who do have prodigious memories. These people have a rare condition known as savant syndrome (學(xué)者癥候群). Savants suffer from a developmental disorder, but they also exhibit great talents that contrast(顯出差異) sharply with their physical and mental disabilities.

Kim Peek (1951-2009) was a savant who lived in Salt Lake City, Utah, in the United States. He was born with damage to parts of his brain, but it seemed that other parts of his brain, particularly those relating to memory, became over-developed.

Peek’s unique abilities appeared at a very early age. When he was just 20 months old, he could already remember every book that was read to him. Peek could read two pages of a book at the same time---one page with the right eye and one with the left---in less than 10 seconds and remember everything he read. By the time he died, Peek had memorized more than 9,000 books. He could remember all the names and numbers in a variety of telephone books. He could remember thousands of facts about history, literature, geography and sports.

Dr. David Treffert, an expert on savant syndrome, once described Peek as “a living Google” because of his astonishing ability to memorize and connect facts. However, at the same time, Peek was unable to carry out simple tasks, such as brushing his hair or getting dressed, and he needed others to help him. In 1989, the movie Rain Man won the Oscar for best Picture. The main character in the movie, played by Dustin Hoffman, was based on Kim Peek’s life. He started to appear on television, where he would amaze audiences by correctly answering difficult questions on different topics. Peek became world famous, and he and his father began touring widely to talk about overcoming disabilities. He inspired a great many people with his words. “Recognizing and respecting differences in others, and treating everyone in the way you want them to treat you, will make our world a better place for everyone. Everyone is different.”

1.The underlined word “prodigious” in Paragraph 1 probably means ________.

A. happy B. vivid C. amazing D. short

2.According to the text, Peek ________.

A. could take care of himself

B. was born with a good memory

C. was the student of Dr. David Treffert

D. became brain-damaged at 20 months old

3.How is Paragraph 3 mainly developed?

A. By proving facts. B. By following time order.

C. By analyzing causes. D. By making comparisons.

4.Peek’s words suggest that we should ________.

A. respect different cultures

B. listen to different opinions

C. treat different people differently

D. be respectful of others’differences

查看答案和解析>>

科目：高中英語 來源：2016屆江西省高三上學(xué)期期中考試英語試卷（解析版） 題型：閱讀理解

閱讀下列短文，從每題所給的四個選項（A、B、C和D）中，選出最佳選項。

Patricia was worried．She had a job interview, and she wanted to look good．She decided to get some new clothes．The store owner, Pallas Hansen, helped Patricia find a suit．But when she left the store, she didn’t pay for the suit!

How could Patricia do this? She was in a special store called Career Closet in San Jose, California．Pallas Hansen and Charlotte Krumwiede started this nonprofit store to help women．They knew that many women don’t find jobs because they don’t have the right clothes for a job interview．Women who don’t have a lot of money have to use their money to buy food and clothes for their children．They can’t buy clothes for themselves.

Pallas and Charlotte started the store in 1992 after they heard about a store like this in Chicago．Volunteers work in the store．Working women donate most of the clothes to the store．This makes it possible for the customers at Career Closet to get clothes for free.

Career Closet has helped 2,500 San Jose women, but clothes aren’t the only things women get at the store．They also get confidence．Patricia is 36 years old．Her husband was hurt in an accident, and Patricia needed a job to support her seven children．She went to Career Closet and got a jacket, a skirt, and a blouse．“The whole day made me feel special,” she said．Patricia was a success at her interview, and she got the job．One reason why she got it was that she was wearing the right clothes for the workplace.

Pallas says,” I love this job．Sixty percent of the women get jobs．It’s like being a fairy god-mother.”

1.What do the women get besides clothes at Career Closet?

A．Money

B．Shoes

C．Confidence

D．Chances

2.Where do the clothes at Career Closet come from?

A．Volunteers working in the store

B．Patricia

C．Pallas Hansen and Charlotte Krumwiede

D．Working women

3.We can know from the passage that ____________.

A．women need to wear fashionable dress for work.

B．dressing properly in working place is important.

C．women are trained for the interview in Pallas’s shop.

D．women get the job training in Pallas’s shop.

4.The best title for the passage might be _____.

A．Getting Clothes Free of Charge

B．Fashion

C．Success of women

D．Job Interview

查看答案和解析>>

同步練習(xí)冊答案