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The sustained massive use of pesticides in farming has two effects that are especially pernicious.First, it often kills off the pests' natural enemies in the area.Second, it often unintentionally gives rise to insecticide-resistant pests, since those insects that survive a particular insecticide will be the ones most resistant to it, and they are the ones left to breed.
From the passage above, it can be properly inferred that the effectiveness of the sustained massive use of pesticides can be extended by doing which of the following, assuming that each is a realistic possibility?
A. Using only chemically stable insecticides
B. Periodically switching the type of insecticide used
C. Gradually increasing the quantities of pesticides used
D. Leaving a few fields fallow every year
E. Breeding higher-yielding varieties of crop plants
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在農(nóng)業(yè)中
可以推斷出持續(xù)大量使用殺蟲劑的有效性可以通過以下哪一種來擴(kuò)展，假設(shè)每一種在現(xiàn)實(shí)上都是有可能的？
目標(biāo)：提高大量使用殺蟲劑的有效性 需解決問題：1.殺死害蟲的天敵 2.產(chǎn)生抗藥性
A只使用化學(xué)穩(wěn)定的殺蟲劑，無法解決任意一個(gè)問題
B定期更換所用殺蟲劑的類型，可以解決第二個(gè)問題
C逐步增加殺蟲劑的用量，無法解決任意一個(gè)問題
D每年留幾塊田休耕，無法解決任意一個(gè)問題
E培育高產(chǎn)作物品種，無法解決任意一個(gè)問題
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