3．Women，        to air pollution before giving birth to a baby，are more likely to give birth to children with heart defects，researchers reported on December 29．（　�。�
A．exposedB．exposingC．are exposedD．are exposing

分析 研究人員在12月29日?qǐng)?bào)告說(shuō)，如果在生孩子前暴露于空氣污染中，婦女更可能生出有心臟缺陷的孩子．

解答 答案選A．本題考查過(guò)去分詞；句中已經(jīng)有了謂語(yǔ)動(dòng)詞are，故空格處需要的是非謂語(yǔ)動(dòng)詞，排除C和D；題干中運(yùn)用了短語(yǔ)be exposed to 暴露，遭遇；英語(yǔ)中很多類似的"be+過(guò)去分詞+to do/介詞/從句"的結(jié)構(gòu)往往表示邏輯主語(yǔ)的狀態(tài)，只需要去掉be動(dòng)詞，用過(guò)去分詞短語(yǔ)做狀語(yǔ)、定語(yǔ)或補(bǔ)語(yǔ)，故選A；

點(diǎn)評(píng) 首先判斷選項(xiàng)中的動(dòng)詞在句中是以謂語(yǔ)還是非謂語(yǔ)形式出現(xiàn)，然后根據(jù)選項(xiàng)在句中的功能結(jié)合非謂語(yǔ)的基本用法做出合理的判斷．要關(guān)注常見(jiàn)非謂語(yǔ)動(dòng)詞的搭配．

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