题目内容
18．---May I go swimming alone this afternoon，Dad？---No，you ．It is dangerous．（ ）| A． | may not | B． | mustn't | C． | needn't | D． | don't |
分析 --今天下午我可以单独去游泳吗，爸爸？
--不，你不允许去．它是危险的．
解答 答案：B．考查情态动词．句意"--今天下午我可以单独去游泳吗，爸爸？--不，你不准去．它是危险的．"．A不可以．B不允许．C不需要．D不．结合语境"它太危险了"，可知应该用语气比较强烈的mustn't．表示不允许去．答案是B．
点评 考查情态动词．情态动词在句中不受人称，性别，单复数变化的影响，但是要考虑时态，交际用法等．结合语境，选择情态动词的适当用法．
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A：（72）E I also want to buy one like yours．
B：But I'm afraid it doesn't fit you，（73）D you'd better try a dark color．
A：（74）A Because blue is the symbol of peace and green is the sign of spring．
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