Why is the close planting of trees of the same species avoided in modern orchard

游客2023-08-03  21

问题 Why is the close planting of trees of the same species avoided in modern orchards and forests? [br] The relative stability of the human population has been upset by ______.

选项 A、the proportion of the reproductive age group
B、the influenza epidemic
C、advances in medical science
D、the Black Death in Europe

答案 C

解析 细节题。见文章第二段第三句The relative stability of the human population has been upset by advances in medical science,所以答案为C。
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