問題詳情

4. The author advises farmers to plant diverse crops and rotate them on theirfields because
(A) single crop falls easily to unexpected losses.
(B)diverse plant systems are most productive and consume more CO2.
(C) researchers found polycultures of about ten species produced the greatestbioproduct.
(D) all of the above

參考答案

答案:A[無官方正解]
難度:適中0.5
統計:A(1),B(0),C(0),D(1),E(0)

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