3．What many scientists believe is that thecontinuedpresence of waterallowedthe earth to dissolve harmful gases and acids into the oceans and seas．

分析 許多科學(xué)家認(rèn)為是水的不斷出現(xiàn)，讓地球溶解有害氣體和酸類進(jìn)入海洋．

解答 答案：continued；allowed
解析：根據(jù)句意"許多科學(xué)家認(rèn)為是水的不斷出現(xiàn)，讓地球溶解有害氣體和酸類進(jìn)入海洋"及所給英文提示可知，本題考查continued"持續(xù)不斷的"及allow"允許；使；讓"這兩個單詞．另外需要注意的是根據(jù)句意可知表語從句需使用一般過去時（因為宇宙大爆炸已經(jīng)發(fā)生，地球已經(jīng)形成）．

點評 本題考查單詞填空，做此類題目時一定要仔細(xì)分析句子結(jié)構(gòu)并根據(jù)句意判斷出所缺成分，再找出與所缺成分相對應(yīng)的英文翻譯并注意形式是否會有變化．

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