Look!A man is cutting a tree on the moon．It be true．The teacher said there is no air on the moon．( )A．can'tB．may notC．shouldn'tD．mustn't 题目和参考答案——青夏教育精英家教网—

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19．Look!A man is cutting a tree on the moon．
It ______ be true．The teacher said there is no air on the moon．（　　）

A．

can't

B．

may not

C．

shouldn't

D．

mustn't

分析 --看！一个人在月亮上砍树．
--不可能真的．老师说月亮上没有空气．

解答答案：A．A．can't 表示否定猜测，不可能 B．may not 可能不 C．shouldn't 不应该 D．mustn't一定不要做某事，表示禁止和劝告．根据 there is no air on the moon，可知月亮上没有空气，所以不可能有人在砍树．can't 表示否定猜测，不可能．故选A．

点评本题考查了情态动词的用法．情态动词可以表示对事物的推测，肯定句中由情态动词must/may/might+be 构成，意为"一定是，肯定是/也许是"，否定句由can't+be构成．

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Tips for better （71）familylife
Eat and chat	Share a meal together Talk about each other's lives Listen to children and （72）givethem advice
Read often	Read to children so that they will become interested in knowledge． Look for books that children prefer to （73）read Ask children questions about （74）whatthe books are about．
Plan an outing	Get out of the house to visit some （75）places
Help with （76）schoolwork	Spend more time helping children with their studies．