20.What is even more important is that as the earthcooled down (冷卻),water began to appear on its surface.

分析 更重要的是,隨著地球的冷卻,水開(kāi)始在表面出現(xiàn).

解答 答案cooled down.
考查固定短語(yǔ).根據(jù)句意:更重要的是,隨著地球的冷卻,水開(kāi)始在表面出現(xiàn).cool  down是英語(yǔ)的固定短語(yǔ)"冷卻",因?yàn)楸碚Z(yǔ)從句的主句用的是過(guò)去時(shí),所以as引導(dǎo)的狀語(yǔ)也用過(guò)去時(shí),所以答案填cooled down.

點(diǎn)評(píng) 所謂固定結(jié)構(gòu)和固定搭配是指英語(yǔ)中一些不能隨意更改的習(xí)慣表達(dá).如固定短語(yǔ)中的詞不能缺,固定搭配要前后一致等,對(duì)于涉及英語(yǔ)固定短語(yǔ),固定結(jié)構(gòu)的題目,只能是靠著平時(shí)的準(zhǔn)確積累和記憶來(lái)做對(duì)題目.

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