1. Typical of the grassland dwellers of the continent is the American antelope, or pronghorn.

1.美洲羚羊，或称叉角羚，是该大陆典型的草原动物。

2. Of the millions who saw Haley’s comet in 1986, how many people will live long enough to see it return in the twenty-first century.

2. 1986年看见哈雷慧星的千百万人当中，有多少人能够长寿到足以目睹它在二十一世纪的回归呢?

3. Anthropologists have discovered that fear, happiness, sadness, and surprise are universally reflected in facial expressions.

3.人类学家们已经发现，恐惧，快乐，悲伤和惊奇都会行之于色，这在全人类是共通的。

4. Because of its irritating effect on humans, the use of phenol as a general antiseptic has been largely discontinued.

4.由于苯酚对人体带有刺激性作用，它基本上已不再被当作常用的防腐剂了。

5. Insgroupsto remain in existence, a profit-making organization must, in the long run, produce something consumers consider useful or desirable.

5.任何盈利组织若要生存，最终都必须生产出消费者可用或需要的产品。