第二部分 英语知识运用（共两节，满分45分）
第一节 单项选择（共15小题；每小题1分，满分15分）
21. We often put one of the fingers to our lips as a to be quiet.
A. mark B. symbol C. meaning D. sign
22 .It’s very common adolescents like to try new things.
A. when B. as C. that D. what
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