Scientists are debating how to limit their newly-discovered power to change genetic structure . Scientists already modify the genes of farm animals and agricultural plants to make them more productive 题目和参考答案——青夏教育精英家教网—

题目内容

Scientists are debating how to limit their newly-discovered power to change genetic structure (结构). Scientists already modify the genes (基因) 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, small flying insects, that carry the Zika virus. They might also be able to permanently remove species (物种) of plants and animals that are damaging to other species.

In a report published last week, the U. S. National Academies of Sciences, Engineering and Medicine (NAS) said it supports continued 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 (释放) into the wild.

Sixteen biologists, ethicists (伦理学家) and policymakers are on an 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 modified organisms (生物体) 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 modified organism mates with another species. They are not yet sure how the modified 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. Getting rid of damaging species forever.

C. Having the changed genes in their next generations.

D. Making all the species more productive and stronger.

【小题２】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 than before.

C. They may cause damage to their living habitat.

D. Their genes may spread to later generations.

【小题３】Which of the following is true according to the passage?

A. Scientists are certain what exact results gene modification leads to.

B. Gene modification can benefit some farm animals and agricultural plants.

C. Scientists won't modify any genes before they make the final decision.

D. Gene modification will be encouraged in more creatures in the near future.

【小题４】The article is mainly intended to ________.

A. appeal against research on gene control

B. show how to change genetic structure

C. inform us of power and danger of gene control

D. give the reason why gene modification is necessary

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相关题目

If you like texting and are trying to lose weight, a new study found that using texting to track diet and exercise habits may help you lose weight.

Previous research has shown that keeping food and exercise diaries improves the likelihood of success when you are trying to lose weight. Using a computer or a pen and paper to record information, however, can be a burden and cause some people to give up.

Duke University researchers said using text messages to track eating and exercise habits can save time, and increase the chances that people will stick with their weight-loss rules.

The study included 26 obese women with an average age of 38. The women used daily texting as part of their weight-loss program. The text messages focused on tracking personalized goals, such as avoiding sugary drinks or walking 10,000 steps a day. Messages also provided brief feedback (回复) and tips.

Every morning, the women received a text from an automated system that said, “Please text yesterday’s personal information of steps you walked and how many sugary drinks you had.” Based on the women's responses to the text message, the system sent another text with personalized feedback and tips.

After six months, the women who used daily texting lost an average of nearly 3 pounds, while another group of women who used traditional methods to keep food and exercise diaries gained an average of 2.5 pounds, according to the study, which was published in the Journal of Medical Internet Research.

“Text messaging has become popular and may be an effective method to simplify tracking of diet and exercise behavior,” Dori Steinberg, who was responsible for this research, said.

Steinberg said, "Text messaging offers several advantages compared to other self-monitoring methods. Unlike web-based diet and exercise diaries, data in a text message can be entered quickly on nearly all cellphone platforms so it is very convenient to receive feedback. Besides, because of the limited number of words used in text messages, it saves time.”

1.According to the study, traditional methods _________.

A. are easier for people to lose weight

B. may cause people to give up losing weight

C. provide brief feedback and tips

D. are easy to track diet and exercise behavior

2.Which is NOT true about text messaging according to Steinberg?

A. It saves time.

B. It saves money.

C. It can be entered quickly.

D. It is easy to receive feedback.

3.What’s the best title for the text?

A. Texting helps keep healthy

B. Texting saves time and money

C. Texting can help you lose weight

D. Texting provides brief feedback and tips

4.What’s Dori Steinberg’s attitude towards text messaging?

A. Unknown. B. Negative.

C. Positive. D. Unconcerned.

Zoos are places 1. animals are kept. There are some reasons 2. keeping animals in zoos.

Firstly, zoos are entertaining and interesting places of children. Most children like to see animals in zoos. Zoos also offer people 3. (live) in big cities a chance of getting close to nature.

Secondly, it is easier for scientists to research animals’ lives when they are kept in zoos than they are in forests. Scientists can study animals’ 4. (relate), their life cycles, or their habits to learn how to breed animals, 5. can reduce animal 6. (extinct).

Furthermore, the risk of dying out of some 7. (endanger) animals is reduced because they are kept in safety.

8. , zoos also cause some problems for animals, such as restrictions on their freedom. They also lose their “wild” character. For example, tigers might lose their 9. (hunt) skills. Besides, zoos cost a lot of money for land, animals’ food and labors. This may charge 10. (expense) for people who want to visit zoos.

假定你是学生会主席李华。你校将举办一场英语才艺表演(talent show)，想邀请你校外籍教师Black先生前来观看并做评论。请你按照下面内容用英语给他写一封电子邮件。

主题:English — Bridge to the World

时间:3月31日上午8:30—ll:30

地点:体育馆

内容:每班一个节目，歌曲、舞蹈、课本剧、故事、演讲等形式不限

联系人:李华(电话13613856789)

注意：

1. 词数:100左右(开头和结尾已为你写好，不计入总词数);

2. 可适当增加细节，以使行文连贯。

参考词汇:评论comment;体育馆gymnasium;课本剧textbook drama

Dear Mr. Black，

With best wishes,

Li Hua

HIGHFIELD COMPREHENSIVE SCHOOL SCHOOL REPORT Form Teacher: G. Baker Pupil’s Name: Simon Watkins Term: Summer 2016 Form: B
Subject	Exam	Class work	Comments
English	59	61	Simon has reached a satisfactory standard but now needs to apply himself with more determination.
Mathematics	77	85	Sound work and progress throughout the year. Well done!
History	46	53	A disappointing exam result. He is unable to give attention to this subject for long.
Chemistry	78	85	His obvious ability in the subject was not fully reflected in his exam work, but I have high hopes for him nevertheless.
Physics	86	94	An excellent term’s performance. He goes from strength to strength. A born scientist, I feel.
Biology	57	60	This time next year he will be taking the "O" Level exam. He needs to concentrate on（全神贯注于） the work, not on class conversation.
French	41	46	Clearly he didn’t revise. His general attitude is far too casual.
Physical Education	/	31	Weak. It’s time he exercised his body more and his voice less. He should try to work with a team.
FORM TEACHER’S REMARKS Basically satisfactory work and progress though he will now have realized, I hope, that in certain subject areas he needs to make speedy improvement. HEADMASTER I shall pay attention to his progress in his weaker subjects though his success in the sciences is most pleasing.

1.According to the comments of the Physical Education teacher, Simon _____.

A. is too talkative in the class

B. likes to work with his classmates

C. doesn’t exercise his body at the right time

D. becomes weak because he doesn’t exercise at all

2. Which of Simon’s subjects will attract the headmaster’s attention in future?

A. Biology and Maths. B. History and French

C. English and Chemistry. D. Physics and Physical Education.

3. Which of the following statements best describes Simon?

A. He has made great progress in language classes.

B. His potential has been fully reflected in science classes.

C. His grade in maths makes him a born scientist.

D. He needs to improve his attitude on certain subjects.

4. Based on the school report, which of the following statements is true?

A. Simon didn’t bother his teacher to revise French.

B. Simon is a determined learner in English.

C. Basically, Simon did a good job in science.

D. Simon is able to pay attention to history for long.

Nobody can be successful in everything in life. In other words, you might fail ________ others succeed or the other way around.

A. whereB. sinceC. althoughD. unless

My friends thought they had made things very smooth for me, but I felt there was still much to ________ with.

A. wrestleB. compromiseC. associateD. stress

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有十处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线划掉（\）。

修改：在错的词下划一横___线，并在其下面写出修改后的词。

注意：1、每处错误及其修改均仅限一词；

2、只允许修改10处，多者（从第11处起）不计分。

I hardly remember my grandmother. She used to holding me on her knees and sing old songs. I was only four when she passes away. She is just a distant memory for me now.

I remember my grandfather very much. He was tall, with broad shoulder and a beard that turned from black toward gray over the years. He had a deep voice, which set himself apart from others in our small town, he was strong and powerful. In a fact, he even scared my classmates away during they came over to play or do homework with me. However, he was the gentlest man I have never known.

Seeing a stranger with a knife in his hand, the little girl stood under the tree, ________ out of her mind.

A. frightenedB. be frightened

C. to be frightenedD. frightening

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