2. 职称英语
  3. In some places leaves will fall off the trees before they change colors in the a

In some places leaves will fall off the trees before they change colors in the a

游客2023-09-16  14
问题 In some places leaves will fall off the trees before they change colors in the autumn. [br] 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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