第二部分：词汇知识运用（共两节，满分40分）
第一节：多项选择（共10 小题；每小题1分，满分10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. Treatments at that time were neither ________ nor effective, and many patients died because of infections.
A. critical B. responsible C. necessary D. scientific
22. Now that there are only a few minutes left, Sam, we’d better talk about the case _______.
A. in common B. in total C. in detail D. in general
