作业讲评：

All these people get healthful rewards from the environment in which they work. They all come from mountain regions. They live and work at elevations of 1, 600 to 4, 000 meters above sea level. The air has less oxygen and is pollution-free. This reduced-oxygen environment makes the heart and blood vessel system stronger.

Another factor that may contribute to the good health of these people is their isolation. To a great extent, they are separated from the pressures and worries of industrial society.

Inherited factors also play some role. Most of the longest-lived people had parents and grandparents who also reached very old ages. Good family genes may, therefore, be one factor in living longer.

It is clear that isolation from urban pressures and pollution, clean mountain air, daily hard work, moderate diets, good genes, and a youthful approach to life all contribute to the health and long life of all these people.

所有这些人都从他们的劳动环境中获得了有益的回报—健康。他们都出生在山区。他们在海拔1,600至4,000米的高山上生活着，劳动着。空气中氧气稀少，没有污染。这种缺氧环境强化了他们的心脏和血管系统。

可能对这些人的健康有益的另一个因素是他们与世隔绝。他们在很大程度上远离了工业社会的压力和忧虑。

遗传因素也起着某种作用。大多数长寿者的父母和祖父母也活到很大的年龄。因此，好的家族基因也可能是长寿的一个因素。

显然，远离城市的压力和污染，洁净的山区空气，艰苦的日常劳作，有节制的饮食，良好的遗传基因，以及永葆青春的生活态度，所有这些都有助于这些人的健康和长寿。

中南大学2010年硕士研究生入学考试试题

Examination in Basic English

Part I. Diction (30%)

Directions: Choose the ONE word or phrase which would best keep the meaning of the underlined part or fill the blank in each of the following sentences.

1. a. confusion of mind b. entertainment

c. nonchalance d. scripture

2. a. amazing b. catastrophic

c. alarming d. frightening a. throw away b. be made of

c. come from d. be made from

4. a. demonstration b. conference

c. distribution d. dissertation

5. a. depressed b. sure

c. ecstatic d. uncertain

6.