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发布时间：2006-06-21 20:59     点击：

(B) chilled with

(C) subjected to

(D) deprived of

16. What must be done to release the internal stresses that build up in glass products during manufacture?

(A) the glass must be reheated and evenly cooled.

(B) the glass must be cooled quickly.

(C) The glass must be kept moist until cooled.

(D) The glass must be shaped to its desired form immediately

17. The word "induced" in line 21 is closest in meaning to

(A) joined

(B) missed

(C) caused

(D) lost

18. The word "it" in line 22 refers to

(A) feature

(B) glass

(C) manner

(D) viscosity

19. According to the passage. why can glass be more easily shaped into specific forms than can metals

(A)It resists breaking when heated

(B)It has better optical properties.

(C)It retains heat while its viscosity changes.

(D) It gradually becomes softer as its temperature rises.

Question 20-30

A great deal can be learned from the actual traces of ancient human locomotion: the footprints of early hominids. The best-known specimens are the remarkable tracks discovered at Lactoli, Tanzania, by Mary Leaky. These were left by small hominids around 3.6 to 3.75 million years ago, according to potassium – argon dates of the volcanic rocks above and below this level. These hominids walked across a stretch of moist volcanic ash, which was subsequently turned to mud by rain, and which then set like concrete.

The study of fossil footprints is not restricted to examples from such remote periods. Hundreds of prints are known, for example, in French caves dating from the end of the last ices age, approximately 10,000 years ago. Research by Leon Pales, using detailed silicon resin molds of footprints mostly made by bare feet, has provided information about this period.

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