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DNA(Deoxyribonucleic acid)is one of the ...

DNADeoxyribonucleic acidis one of the most important discoveries in science. DNA is the plan for the human beingas a blueprint is the plan for building. DNA makes a person look the way he does. A person’s DNA comes from a mixing of his parents’ DNA. That’s why a child looks like his parents. Butbesides controlling things such as height and hair colorDNA can also give people diseases. Scientists are now studying DNA to cure(治疗) diseases.        

In the seventies, scientists developed a process called recombinant (重新组合) or RDNA. Although it sounds difficult to understandRDNA simply means taking DNA from one animal or plant and putting it into another. By doing soscientists can create new beings. In doing soscientists can better understand DNA, especially what parts of DNA do. After they understand DNAscientists can begin to cure diseases. Oftenthe new being created itself will be the cure.

Besides curing diseasesRDNA research can also do other things. For example, scientists in Japan have already created “super-trees”. Trees help humansbecause they take CO2, which poisons humans, from the air and turns it into oxygen, which lets humans breathe. “Super-trees” do this toobut do it much faster. As things such as cars and factories have already put much CO2 in the area“super-trees” are badly needed.               

Unfortunatelythere is serious danger in RDNA research. Scientists want to create animals to cure old diseasesbut these new animals may also create new diseases. It will be a serious problem if the animals escape from the science laboratory and into nature. As these animals are not natural, they may let loose many new powerful diseases.               

As a resultRDNA research will create many solutions(解决方案),but it will also create many problems.

1.From the passage, we can know that a boy looks like his parents because        .

A. he is son of his parents

B. his parents’ DNA decides his appearance

C. he has received DNA from his father or his mother

D. scientists have put some of his parents’ DNA into him

2.The following statements are true about RDNA research EXCEPT      

A. RDNA research will benefit human beings a lot

B. super-trees might be widely planted around the world

C. scientists have not completely understood DNA

D. the research has been stopped because the created animals carry virus (病毒)

3.What does the underlined expression “let loose” in  paragraph 4 probably mean

A. let...go free    B. get rid of (去除)    C. absorb (吸收)    D. survive

4.What is the best title for the passage

A. The DNA Research in Japan

B. A New Way of DNA Research in Japan

C. The Advantages and Disadvantages of RDNA

D. The Causes and Effects of DNA Research

 

1.B 2.D 3.A 4.C 【解析】试题分析:我们大家都知道DNA指的是遗传基因,但是什么是RDNA呢?本文主要讨论RDNA这个神秘的微观世界。 1.细节理解题。根据第一段四、五句“A person’s DNA comes from a mixing of his parents’ DNA. That’s why a child looks like his parents.”可知,孩子之所以看起来像父母是因为父母的DNA决定了他的相貌。故选B。 2.细节理解题。由于“super-trees”能比普通的树更快地吸收二氧化碳,所以能在全世界种植,故B项正确;根据第一段最后一句可知,科学家还没有完全理解DNA,故C项正确;根据第二段三、四两句可知,通过研究RDNA,科学家可以更好的理解DNA,治愈疾病,故A项正确;根据最后一段可知,科学家将寻找解决办法,并没有因为被创造的动物携带病毒而停止研究。故选D。 3.词句猜测题。画线句上文讲述这种被科学家们创造出来的动物可能会产生新的疾病,所以如果它们从实验室中逃脱,将是一个严重的问题。因此推断因为这些动物不是天生的,它们可能会“释放”很多新的可怕的疾病。故选A。 4.标题判断题。纵观全文可知,第一段通过讲述DNA引出对RDNA的话题,从第二段开始一直在讲述的都是RDNA优点和缺点,因此推断选项C“RDNA优点和缺点”为最佳标题,概况了内容是文章的中心。故选C。
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