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
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