问题
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If demand is rising but the firm __________ from communication failure, then stocks wi
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From thousands of kilometers above our earth, a communications satellite ______ a signal f
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______the atmosphere around our Earth, we would not be able to live.A.Had it not been forB
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The long-awaited Hubble Space Telescope, ______ to orbit the Earth next March, will observ
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One major ______ of space travel is the radiation that exists beyond Earths atmosphere.A.m
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The sun is____________ far away from the earth.