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'tB．may notC．shouldn'tD．mustn't

分析 --看！一個(gè)人在月亮上砍樹．
--不可能真的．老師說月亮上沒有空氣．

解答 答案：A．A．can't 表示否定猜測，不可能  B．may not 可能不  C．shouldn't 不應(yīng)該 D．mustn't一定不要做某事，表示禁止和勸告．根據(jù) there is no air on the moon，可知月亮上沒有空氣，所以不可能有人在砍樹．can't 表示否定猜測，不可能．故選A．

點(diǎn)評 本題考查了情態(tài)動(dòng)詞的用法．情態(tài)動(dòng)詞可以表示對事物的推測，肯定句中由情態(tài)動(dòng)詞must/may/might+be 構(gòu)成，意為"一定是，肯定是/也許是"，否定句由can't+be構(gòu)成．

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