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

游客2024-03-06  20

问题 Why is the close planting of trees of the same species avoided in modern orchards and forests? [br] The number of the bellbird in New Zealand got controlled by ______.

选项 A、the decrease in distribution
B、human predation
C、deliberate introduction of its enemy animal
D、spread of certain kind of disease

答案 D

解析 细节题。见文章第三段第—句The decrease in distribution and numbers of some species of native birds in New Zealand- the bell bird for example-has been attributed to disease rather than predation,所以答案为D。
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