2. 外语
  3. In some places leaves will fall off the trees before they change colors in the autumn. Up until now, scientists still could not

In some places leaves will fall off the trees before they change colors in the autumn. Up until now, scientists still could not

admin2009-04-23  65
问题 In some places leaves will fall off the trees before they change colors in the autumn.
Up until now, scientists still could not explain how leaves will change colors during the fall.
选项 A、Y
B、N
C、NG
答案B
解析 由题干中的how leaves will change colors定位到文章第一个小标题下的内容。再由题干中的scientists定位到这个小标题下的第1、2句For years，scientists have worked…we do know enough to explain the basics and help you to enjoy more fully Nature’s multicolored autumn farewell．题干中的leaves will change colors during the fall与原文中的the changes that happen to trees and shrubs in the autumn属同义转述；题干中的still could not explain和原文中的we do know enough to explain the basics相矛盾，因此题干表述错误。注意表让步转折的although容易设题。
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