2. 外语
  3. In some places leaves will fall off the trees before they change colors in the autumn. The process that the veins gradually clo

In some places leaves will fall off the trees before they change colors in the autumn. The process that the veins gradually clo

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问题 In some places leaves will fall off the trees before they change colors in the autumn.
The process that the veins gradually close off and trap sugars in the leaves will cause leaves______.
选项
答案fall
解析 由题干中的veins gradually close of和trap sugars定位到第四个小标题下的第2、3句The veins…gradually close off…These clogged veins trap sugars in the leaf…；再由process定位到这段段首In early autumn…the processes leading up to their fall．此处需要填入名词性成分。本段首句是主题句，第2、3句是用来说明这个过程是怎样进行的，题干中的 cause与原文中的leading up to属同义转述。故答案为fall。
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大学英语六级

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