摘要：第一节 单项填空(共15小题,每小题1分.共1 5分) 从A.B.C.D四个选项中.选出可以填人空白处的最佳选项.21. What public is concerned about is whether medical workers and scientists will be able to find cure for this new disease after the vaccine is tried on volunteers. A. 不填,不填,不填 B. the ; the ; 不填 C. the ; 不填 ; the D. the ; a ; the

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