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Why is the space statioreluctant to receive more paying tourists according to Frank Culbertson( )
·Because the space statioisn’t big enough for the paying tourists.
·Because as a place for doing research, the statoshould be highly efficient.
·Because a paying tourist may be ignorant of the space research work.
·Because the paying tourists have to pay too much to gaispace experience.

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出自：佳木斯大学语言治疗学

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