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【C1】______Space Agency is planning to【C2】______a spacecraft to the planet Mars. The spacecraft will be called Mars Observer. The project was to have【C3】______place in 1990. But it has been postponed. The Space Agency now【C4】______to send the spacecraft to Mars in 1992.
The Mars Observer is to【C5】______from an America's space shuttle. It will then【C6】______around tile North and South Poles of Mars. The spacecraft will have cameras to【C7】______pictures of the atmosphere and surface of Mars. Its major task is to look【C8】______signs of life.
The last voyage【C9】______Mars was in 1976. That was【C10】______the two American Viking spacecrafts land- ed on the planet. The next voyage was planned【C11】______1988 by the Soviet Union.
America's Mars Observer Project will【C12】______about $ 25.000.000. The high cost is one reason the Space Agency postponed the project. A【C13】______of scientists have criticized that decision. Carl Sagan of Cornell university【C14】______it "a great mistake". And the head of the Planetary Society said the project should not be postponed now【C15】______it appears to【C16】______support in Congress. Congress must【C17】______money for it. Some scientists have proposed a solution that would save【C18】______time and money. They say the Mars Ob- server be launched in 1990【C19】______planned, but on a traditional rocket【C20】______of the space shuttle.
【C1】
A.America
B.American
C.America's
D.Americans
第8题
学习策略中的一种——元认知策略,包括制订认知计划(计划策略)、监控计划执行(监控策略)和()。
A.调节策略
B.精加工策略
C.组织实施策略
D.价值性
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