2. 外语
  3. In some places leaves will fall off the trees before they change colors in the autumn. The example that Sourwood changes colors

In some places leaves will fall off the trees before they change colors in the autumn. The example that Sourwood changes colors

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问题 In some places leaves will fall off the trees before they change colors in the autumn.
The example that Sourwood changes colors before other species do illustrate that the timing of color change______.
选项
答案varies by species
解析 由题干中的Sourwood定位到第二个小标题下的末段第2句，再由the timing of color change定位到这段段首The timing of the color change also varies by species．Sourwood(酸叶石楠)in southern forests can become．．．此处需填入宾语从句的谓语成分。本段段首指出树叶改变颜色的时间也随着物种的不同而不同，下文用酸叶石楠在其他植物还是绿色的时候就改变了叶子颜色的例子来证明这个论点。题目将这个顺序颠倒了一下，问举酸叶石楠这个例子的目的是什么，故段首的谓语部分varies by species就是答案。
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大学英语六级

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