摘要:第一节 单项选择(共15小题,每题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.Such medical equipment is in danger of breaking down, if not taken good care of. A.a; the B.a; / C./; the D./; /

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