13．Eating too many sweets ______ our teeth．（　　）
A．is good forB．is bad forC．are good forD．are bad for

分析 吃太多甜食對我們的牙齒有害．

解答 答案：B．考查形容詞短語．句意"吃太多甜食對我們的牙齒有害．"．結(jié)合語境，動名詞短語做主語，謂語動詞用單數(shù)，因此C，D不正確．be good for對…有好處．be bad for對…有害．由sweets甜食，可知吃太多對牙齒有害，因此A不正確．答案是B．

點評 考查形容詞短語，在日常學(xué)習(xí)中要積累一些形容詞短語的固定用法，結(jié)合語境，選擇合適的形式．完成試題．

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