摘要:第一节 单项填空(共15小题.每小题1分.满分15分) 从A.B.C.D四个选项中选出最佳选项填入空白处.并在答题卡上将该项涂黑.21. The space station spins slowly in space to imitate pull of the earth’s gravity. A. the; / B. /; the C. /; / D. the; the

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