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9B
Unit 1 Life on Mars
典例解析
一、单项选择
1. Be sure ______
and ______ the windows open when you leave.
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A. to lock the
door; not to leave
C. to lock the
door; not leave
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B. lock the door;
to leave
D. lock the door;
not to leave
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[答案]A
[解析]此题考查固定搭配“be sure to do”。表示“务必，一定要，不要忘记”，是说话人的一种要求或命令。根据语境推断出“一定要锁上门，窗没有开”故选A。
2. ______ is the
matter there?
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A. What on the
earth
C. What earth
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B. What on earth
D. What on Earth
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[答案]B
[解析]此题考查“on earth”的用法。此处on
earth有加强语气的作用，意为“到底，究竟”，earth不用大写E。故选B
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