2. 外语
  3. In some places leaves will fall off the trees before they change colors in the autumn. When the chlorophyll is decreasing, ____

In some places leaves will fall off the trees before they change colors in the autumn. When the chlorophyll is decreasing, ____

admin2009-04-23  96
问题 In some places leaves will fall off the trees before they change colors in the autumn.
When the chlorophyll is decreasing, ______are the most important weather conditions affect the color displays of leaves.
选项
答案temperature and moisture
解析 由题干中的the chlorophyll is decreasing和weather conditions定位到第二个小标题下第1段内容The amount and brilliance of the colors…Temperature and moisture are the main influences．此处需要填入名词性成分。题干中的the most important weather conditions与原文中的main influences属同义转述。故答案为temperature and moisture。
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