第二部分 词汇知识运用(共两节，满分30分)
第一节 多项选择（共10小题；每小题1分，满分10分）
21. People think “SOS” is the simplest and common _______ to make in time of danger or disaster.
A. mark B. sign C. signal D. remark
22. Bending down, he _______ the footprints that hadn’t been blown away in the wind, concluding that they belonged to a wolf.
A．ignored B．inspected
C．expanded D．defended
23. Harry, you can’t go out since you haven’t finished your homework; _______, a heavy rain is upon us tonight.
