2. 外语
  3. In some places leaves will fall off the trees before they change colors in the autumn. The precondition of the appearance of an

In some places leaves will fall off the trees before they change colors in the autumn. The precondition of the appearance of an

admin2009-04-23  93
问题 In some places leaves will fall off the trees before they change colors in the autumn.
The precondition of the appearance of anthocyanins is there is sugar in the leaf cells.
选项 A、Y
B、N
C、NG
答案C
解析 出题干中的anthocyanins定位到文章第二个小标题下的第3点Anthocyanins，which give color to…；再由题干中的sugar定位到下段末句Most anthocyanins  are produced in the autumn…本题涉及花青素出现的先决条件。文中介绍了花青素的作用，并提及由于充足的光照和叶细胞内过多的糖分，多数花青素都生产于秋季。但并未涉及花青素出现的先决条件，因此应判断本题为NG。
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大学英语六级

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