摘要:第一节:语法和词汇知识(共15小题,每小题1分.满分15分) 从A.B.C.D四个选项中.选出可以填入空白处的最佳选项.并在答题卡上将该项涂黑.21.Although everything seems to have been taken into consideration. accident can happen when the astronauts walk in space. A.不填,the B.an,the C.the,the D.an,不填

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