题目内容

18．We are putting too much carbon dioxide into the atmosphere，which prevents heat from escaping from the earth．

分析 我们把太多的二氧化碳排放到了大气中，这便阻止了热量从地球上逸出．

解答 答案：prevents
根据句意以及首字母的提示可知，此处在句中作谓语，并与其后的from构成：阻止…做某事；由于本句是非限定性定语从句，关系代词which指代前面的句子在该从句中作主语，根据主句使用了一般现在时可知，此处的谓语动词应使用第三人称单数形式，故用prevents．

点评 做类似的题时，首先应根据句意以及首字母的提示判断出空缺处的意思；其次从语法分析的角度，确定出应填单词的形式；因此在平时的学习中，除了应牢固记忆单词的拼写之外，还要熟练掌握一些的语法知识．

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