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英国伦敦大学的研究人员最近发现,人的耐力与体内的一种基因有很大的关系。如果人体内的这

题型:单项选择题

题目:

英国伦敦大学的研究人员最近发现,人的耐力与体内的一种基因有很大的关系。如果人体内的这种基因按某种特定形式存在,人就容易在需要耐力的体育运动中取得好成绩。该大学心血管遗传中心蒙哥马利博士领导的研究小组,是在对征服了高海拔山峰的登山运动员和在军训中表现出色的新征人伍的士兵进行DNA测试后得出上述结论的。据介绍,所有这些登山者,都是在没有携带氧气瓶等呼吸设备的情况下顺利地登上了海拔7000米以上的高峰。而75名接受调查的新兵,都是在为期10天的大强度军事训练中成功地坚持下来的。
科学家们发现这些体能素质超群者的ACE(血管紧张肽转换酶)基因的存在有某些共同特征。这种基因在人体内的存在有I和D两种形式,形式I使人体血液中的ACE数量减少,形式D能起相反的作用。每个人体内有两个这种基因,或是两个I,或是一个I一个D,或是两个D。科学家们通过研究证实,拥有至少一个I基因的人,其耐力比拥有两个D基因的人要强。研究人员推测说,I基因能增强肌肉细胞吸收氧或其他营养成分的能力,因而有助于增强人的耐力。
研究者指出,由于运动能力还与敏捷性、手眼协调等许多其他因素有关,因此这一成果不一定能用于选拔和培养运动员。但如果进一步研究并证明I基因确实可以提高细胞的工作效率,那么可能为中风或心脏病患者找到一种新的治疗手段。

对文意概括准确的一项是( )。

A.讨论了人的耐力维度

B.关于人的耐力与基因的关系

C.体能素质超群的原因的探讨

D.ACE的发现及功能

答案:

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     The US is one of the biggest countries in the world. It is well-known because its population comes

from all over the world. The immigrants(移民) can learn English to keep the United States united, but it

is unfair to have to drop their culture for an American way of life.

     I believe that recent immigrants should learn English in order to live in this country. If they don’t learn

English, they won’t be- able to communicate and do what they want. Anita, one of my mother’s friends,

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daughter got a serious fever. She didn’t know what was going on, so she tried to call an ambulance(救

护车). However, when she called the hospital, she couldn’t talk. The operator(接线员) couldn’t

understand what Anita was saying. Thankfully, her sister arrived and called the ambulance. The doctor

told Anita that if she hadn’t arrived at the hospital in time, her daughter would have died.

    Immigrants should learn English to speak with the public, but they should also keep their language at

home. If we learn English only and forget our own language, we won’t be able to communicate with our

parents. Florence, my co-worker, speaks English only. Her mother didn’t teach her Spanish, her mother

language. She has lost her mother language, tradition and culture, so she can’t pass them down to her

future generations.

    In conclusion, immigrants should learn English in order to communicate with the public and to keep the

country united, but they shouldn’t drop their culture for an American way of life.

1. When Anita’s daughter was ill, Anita___________.

A. couldn’t speak

B. tried to call an ambulance

C. called her sister for help at once

D. sent her to the hospital immediately

2. The author mentions Anita’s experience mainly to show us __________.

A. English is a difficult language for immigrants to learn

B. immigrants should help each other in a strange country

C. it is necessary for immigrants to learn the common language

D. immigrants should keep their own language and culture

3. Florence is a woman who _______________.

A. can speak both English and Spanish

B. was born in Spain but grew up in the US

C. has given up her native culture

D. is one of the author’s classmates

4. Which of the following best describes the organization of the passage?

           A                               B                               C                             D

5. What’s the author’s attitude towards immigrants?

A. immigrants should learn English well

B. immigrants should speak their own language

C. immigrants have to drop their own culture for American way of life

D. immigrants should learn English as well as keep their own language

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