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Text 【C1】______Space Agency is planning to【C2】______a spacecraft to the planet Mars. The spacecraft will be called Mars Observ
Text 【C1】______Space Agency is planning to【C2】______a spacecraft to the planet Mars. The spacecraft will be called Mars Observ
admin
2011-01-23
58
问题
Text
【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.
【C15】
选项
A、as
B、for
C、since
D、because
答案
D
解析
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公共英语三级笔试题库公共英语(PETS)分类
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