问题
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The shuttle exploded in the air suddenly and broke into ______ at once.A.diversityB.fragme
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The city ______ is given the nickname "Space City of USA".A.BostonB.HoustonC.San Francisco
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The key to the industrialization of space is the U. S. space shuttle.【C1】______it, astrona
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The long-awaited Hubble Space Telescope, ______ to orbit the Earth next March, will observ
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The space between cylinder liner and jacket is called _____.A.the cooling waterB.the circu
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Space exploration has been made ______ with the development of modern science and technology.A.it po