Scientists are debating how to limit their newly-discovered power to change genetic structure. Scientists have already changed the genes of farm animals and agricultural plants to make them more productive or stronger. But now they can also change genes in wild animals and plants. These genes would continue into later generations. For example，it may be possible for scientists' to remove from existence the kind of mosquitoes that carry the Zika virus. They might also be able to permanently remove species of plants and animals that are destructive to other species.

In a report published last week，the U.S. National Academies of Sciences，Engineering and Medicine said it supports continuing research on this kind of gene control. But it warned that it is not possible to know what will happen when these changed plants and animals are released into the wild.

Sixteen biologists，ethicists（伦理学家）and policymakers are on a National Academy of Sciences（NAS）committee that is examining the issue. They say that there is value to the new technology. But，they say，there is not enough evidence to support the release of changed organisms（生物）from the laboratory into nature.

Many people would support stopping mosquitoes and rats from carrying diseases. But scientists say we must understand the possible scientific，ethical，legal and social results of such action before we decide whether to take it. Gene modification is spread through reproduction（繁殖）.Changed genes will continue to spread as long as an animal or plant continues to reproduce. They cannot be limited to a farm or kept within a country's borders. Scientists are wondering what may happen if a changed organism mates with another species. They are not yet sure how the changed genes would affect the other species. It is possible that those genes could harm those creatures or even lead to their disappearance from our planet.

【小题1】What possible advantage does gene control in wild animals and plants have?

A．Changing the Zika virus permanently.

B．Removing the destructive species forever.

C．Having changed genes in their next generations.

D．Making all the species more productive and stronger.

【小题2】Which of the following is NOT true according to the passage?

A．Scientists are not sure what exact results gene modification leads to.

B．Scientists won't change any genes before they make the final decision.

C．Gene modification has benefited some farm animals and agricultural plants.

D．Scientists have not applied gene modification to wild animals and plants in case of possible danger.

【小题3】As for genetically changed wild animals and plants, what are scientists worried about?

A．They may become weaker or die out.

B．They may be more productive.

C．They may cause damage to their living habitat.

D．Their genes may spread to later generations.

【小题4】What can be the best title for the passage?

A．Stop research on gene control

B．How to change genetic structure

C．Power and danger of gene control

D．Advantages of gene control in wild animals and plants

短文改错

Can you imagine wear a pretty sweater made from garbages? It could happen! A few companies across the country are making clothes from things that are being thrown away by people. For example, company makes sweaters of old plastic bottles. First, the bottles are cut into small pieces. The pieces are melted. Then the melting plastic is made into long and thin threads. The threads are used to make sweaters which feels very soft and light.

Believe it or not, these sweaters sell good in spite of the fact which they are not cheap at all. Many people thought that these recycled clothes can help us cut down on garbage.

   What makes us human？Is it our thoughts？Our emotions？Our behavior？

All of these things make us who we are，but at the center of it all lies the genome — the genes inside our bodies that determine everything from our hair color to our intelligence. But if we could change our genome，would we still be human？

Recently，a group of scientists from the US and South Korea worked together to successfully“edit”a human embryo（胚胎）and remove a genetic mutation（变异）that would have led to heart disease. This was achieved with the help of CRISPR-a gene — editing tool that allows scientists to edit the genome by cutting，changing or adding to parts of it.

Scientists involved in DNA editing are certain about the good of their work，and hope that in the future，diseases could simply be“edited out”.

However，others aren't so sure. People are worried that the science could be used not only to remove life-threatening illness，but also to make a“perfect”baby whose DNA has been chosen to improve its intelligence or other qualities. They say that this is a shallow way of thinking about raising children.

“It makes you think about who we are as people，and it makes you ask if humans should use the kind of power…that is changing human evolution（进化），”Jennifer Doudna of the University of California said.

Still，others worry that DNA editing could be turned into an expensive service that would only be available to the people who could afford it. That might mean the rich would be given another advantage in a world where they already have plenty of them.

“You could find wealthy parents buying the technology for their children, leading to even greater inequality than we already live with,”Marcy Darnovsky, director of the San Francisco Center for Genetics and Society, said.

【小题1】Why are the questions asked in Paragraph 1?

A．To attract the readers' interest.

B．To seek answers from the readers.

C．To show those things aren't important.

D．To correct our understanding of human beings.

【小题2】Which of the following will Jennifer Doudna most probably agree with？

A．Having a perfect baby is not so good for the family.

B．Life-threatening illnesses should be removed before birth.

C．DNA editing might cause unexpected problems to humans.

D．DNA editing may enlarge the gap between the rich and the poor，

【小题3】What does the underlined word“them”most probably refer to？

A．Advantages.

B．Expensive services.

C．Perfect children.

D．Qualities

【小题4】What's the author's attitude towards DNA editing？

A．Disappointed.	B．Doubtful.
C．Positive.	D．Objective.

语法填空

China's first manned spaceship lifted off at 9 a. m. on Wednesday, October 15th, 2003 in Jiuquan, Gansu Province. It carried China's first astronaut, Yang Liwei, 【小题1】 was a pilot in the army. The launch was 【小题2】（success）. "When the spaceship separated 【小题3】 the rocket, I suddenly got 【小题4】 feeling of soaring into the sky because of the zero gravity, "said Yang Liwei. The Shenzhou V circled the earth 14 times. When the spaceship 【小题5】（do）its seventh circle, Yang showed the flags of China and the United Nations, 【小题6】（express）the wishes of the Chinese people 【小题7】（explore）and use space 【小题8】（peaceful）. Yang landed in Inner Mongolia safely at 6：23 a. m. on October 16th. He told 【小题9】（report）that when Shenzhou V let out its parachute, he felt the ship was shaking. Millions of people all over China were watching TV when the spaceship landed safely. Yang was happy to return home 【小题10】 he thought 21 hours was too short to stay in space.

A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.
“It’s extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. “The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.
They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it’s connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.
While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.
Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”
【小题1】The difficulty the team of engineers met with while making the robotic fly was that __________.

A．they had no model in their mind

B．they did not have sufficient time

C．they had no ready-made components

D．they could not assemble the components

【小题2】It can be inferred from paragraphs 3 and 4 that the robotic fly __________.

A．consists of a flight device and a control system

B．can just fly in limited areas at the present time

C．can collect information from many sources

D．has been put into wide application

【小题3】Which of the following can be learned from the passage?

A．The robotic flyer is designed to learn about insects.

B．Animals are not allowed in biological experiments.

C．There used to be few ways to study how insects fly.

D．Wood’s design can replace animals in some experiments.

【小题4】Which of the following might be the best title of the passage?

A．Father of Robotic Fly

B．Inspiration from Engineering Science

C．Robotic Fly Imitates Real Life Insect

D．Harvard Breaks Through in Insect Study