6．To make our city more beautiful，rubbish ______ into the river．（　�。�
A．needn't be thrownB．mustn't be thrown
C．can't throwD．may not throw

分析 為了使我們的城市更漂亮，垃圾不能扔進河里．

解答 答案是B．本題考查情態(tài)動詞．needn't 不必；mustn't 禁止；不允許；can't不能；may not 也許不；根據(jù)句意，"禁止"向河里扔垃圾，故選B．

點評 要在正確理解情態(tài)動詞的基本含義的基礎上，整體理解語境中的情感態(tài)度，做出合理的判斷．

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