单元检测 unit 5 first aid
（60分钟 巩固训练）
一、单项选择 (共15小题，每小题1分, 满分15分。)
1） 1. ----did you know that
----______ ? i find that very hard to believe.
a. right b. sure c. really d. certainly
2） he takes no ______ in politics.
a. interest b. interested c. interesting d. interests
3） ----is jack on duty today?
----it _______ be him. it’s his turn tomorrow.
a. mustn’t b. won’t c. can’t d. needn’t
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