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

分析 他們把太多的二氧化碳釋放到大氣中的熱量，防止脫離地球進(jìn)入太空

解答 prevents from考查固定短語．根據(jù)句意：他們把太多的二氧化碳釋放到大氣中的熱量，防止脫離地球進(jìn)入太空．prevent…from doing是英語的固定搭配"阻止…干某事"．

點(diǎn)評(píng) 英語中的固定短語，既不能添詞，也不能少詞，是固定的，要求同學(xué)們?cè)谄綍r(shí)記憶準(zhǔn)確，然后根據(jù)句意找出記憶中的固定搭配，做出正確的答案．

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