3.A。文章最后一段是说，尽管的这种新用途对病人很有帮助，但患者在使用时必须格外小心，一定要严遵医嘱。

2.D。注意“…reduce the chance that a healthy, older man will suffer from a heart attack .”本句中的healthy, older这两个词，即可得出答案。

1. D。短文首段的末句“…sharply reduce the chance that a healthy, older man will suffer from a heart attack.”即是本题答案的出处.

4.How many people are going to take cryogenic treatment after they die？

a man who died of cancer come back to life in the future if his body is frozen？Why？

Section III 科普小品篇答案与解析

　Passage 23　[答案与解析]本文介绍了科学家对阿斯匹林的研究成果。实验表明，阿斯匹林可以预防或削弱老年人患心脏病的危险，但实际的效果和服用者的饮食有一定的关系。研究人员说，服用可药品要遵医嘱。

3.How do scientists usually keep a dead man's body？

2.Why do they want the world to keep their bodies well？

1.Where do most people hope that their bodies are kept after their death？

　___________________________________

3.According to the passage, a boy of 14 years old sleeps _____.

　A.as long hours as a grown-up　B.much longer hours than a grown-up

　C.for 14 hours each night　D.for less than 8 hours each night

2.Whether you have got enough sleep is judged (判断) by _______.

　A.how many hours you have slept B. how many hours you need to sleep

　C. if you do exercise and physical work D. if you feel fresh energetic