2011年10月自考英语冲刺试题三（5）

2011年10月自考英语冲刺试题三（5）

Passage Three

Questions 31 to 35 are based on the following passage.

The great advance in rocket theory 40 years ago showed that liquidfuel rockets were far superior in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. However, during the last decade, large solidfuel rockets with solid fuels about as powerful as liquid fuels have made their appearance, and it is a favorite layman's(外行) question to inquire which one is “better.” The question is meaningless; one might as well ask whether a gasoline or a diesel engine is “better.” It all depends on the purpose. A liquid fuel rocket is complicated, but has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited(重新点火) when desired. In addition, the thrust can be made to vary by adjusting the speed of the fuel pumps. A solidfuel rocket, on the other hand, is rather simple in construction, though hard to build when a really large size is desired. But once you have a solidfuel rocket, it is ready for action at very short notice. A liquidfuel rocket has to be fueled first and cannot be held in readiness for very long after it has been fueled. However, once a solidfuel rocket has been ignited, it will keep buming. It cannot be stopped and reignited whenever desired (it could conceivably be stopped and reignited after a pre calculated time of burning has elapsed) and its thrust cannot be varied. Because a solidfuel rocket can be kept ready for a long time, most military missiles employ solid fuels, but manned spaceflight needs the fine adjustments that can only be provided by liquid fuels. It may be added that a liquidfuel rocket is an expensive device; a large solidfuel rocket is, by comparison, cheap. But the solid fuel, pound per pound, costs about 10 times as much as the liquid fuel. So you have, on the one hand, an expensive rocket with a cheap fuel and on the other hand a comparatively cheap rocket with an expensive fuel.　www.Examw.com

31. The author feels that a comparison of liquidand solidfuel rockets shows that ________.

A. neither type is very economical

B. the liquidfuel rocket is best

C. each type has certain advantages

D. the solidfuel rocket is best

32. The most important consideration for manned space flight is that the rocket be ________.

A. inexpensive to construct

B. capable of lifting heavy spacecraft into orbit

C. easily controlled

D. inexpensive to operate

33. Solidfuel rockets are expensive to operate because of their ________.

A. size B. burning time

C. fuel D. complicated engines

34. Which of the following statements is not characteristic of liquidfuel rockets?

A. The fuel is cheap.

B. They are cheap to build.

C. They can be stopped and reignited.

D. They must be used soon after fueling.

35. Which of the following statements is a possible disadvantage of solidfuel rockets?

A. They are complicated.

B. They are uneasily adjusted.

C. They are expensive to construct.

D. They cannot be ready for action with little time for preparation.

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