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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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