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日報告說，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．本題考查過去分詞；句中已經(jīng)有了謂語動詞are，故空格處需要的是非謂語動詞，排除C和D；題干中運用了短語be exposed to 暴露，遭遇；英語中很多類似的"be+過去分詞+to do/介詞/從句"的結(jié)構(gòu)往往表示邏輯主語的狀態(tài)，只需要去掉be動詞，用過去分詞短語做狀語、定語或補語，故選A；

點評 首先判斷選項中的動詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．要關(guān)注常見非謂語動詞的搭配．

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