2. 外语
  3. This passage is mainly concerned with ______. Food that is rich in organic matter ______.

This passage is mainly concerned with ______. Food that is rich in organic matter ______.

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问题 This passage is mainly concerned with ______.
Food that is rich in organic matter ______.
选项 A、has been nourished by fertilizers
B、contains vegetable matter that has not been consumed
C、has had chemicals and fertilizer added to it
D、contains large quantities of vitamins
答案B
解析 根据题意，确定答案在第二段第一句话“...vegetable... been grown in soil...rich in organic matter"，和第二句话“... the soil has been nourished by unused vegetable...”。
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