题目内容
18．It's bad manners to laugh_____ others when they are in trouble．（ ）| A． | at | B． | on | C． | in | D． | to |
分析 嘲笑陷入困境的人们是不礼貌的．
解答 答案：A
根据句意和句中出现的动词短语laugh at，意为"嘲笑"，可知at符合句子意思，故选A．
点评 本题考查常用介词的辨析．在熟知句意的基础上，再联系句子所表达的含义，从而选出正确的答案．
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