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18.They are putting too much carbon dioxide into the atmosphere,whichprevents heatfrom escaping from the earth into space.(防止)

分析 他们把太多的二氧化碳释放到大气中的热量,防止脱离地球进入太空

解答 prevents from考查固定短语.根据句意:他们把太多的二氧化碳释放到大气中的热量,防止脱离地球进入太空.prevent…from doing是英语的固定搭配"阻止…干某事".

点评 英语中的固定短语,既不能添词,也不能少词,是固定的,要求同学们在平时记忆准确,然后根据句意找出记忆中的固定搭配,做出正确的答案.

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