2. 外语
  3. Agriculturists have traditionally considered crop rotation to be______; it helps to preserve soil nutrients, control disease, an

Agriculturists have traditionally considered crop rotation to be______; it helps to preserve soil nutrients, control disease, an

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问题 Agriculturists have traditionally considered crop rotation to be______; it helps to preserve soil nutrients, control disease, and deter weed growth.
选项 A、aesthetic
B、didactic
C、pedantic
D、crucial
E、indispensable
答案D, E
解析 The best answer is D and E. The sentence’s second clause lists the benefits of crop rotation. Therefore, the choices to fill in the blank should be positive. Only choices E and F are strongly positive.
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