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　　阅读段落

　　By the mid-1960s, the situation took an alarming turn with the outbreak of four more new pests, necessitating pesticide spraying to such an extent that 50% of the financial outlay on cotton production was accounted for by pesticides. In the early 1970s, the spraying frequently reached 70 times a season as the farmers were pushed to the wall by the invasion of genetically stronger insect species.

　　段落大意

　　本段介绍了这种“单调综合症”发展到后期令人无法忍受的情形：每季度喷洒70次农药。

　　阅读笔记

　　Mid-1960s：50% of financial outlay on cotton production——pesticides

　　Early 1970s：70 times a season & invasion of genetically stronger insect species

　　逻辑关系

　　1. 并列(无逻辑连接词)

　　By the mid-1960s, the situation took an alarming turn with the outbreak of four more new pests, necessitating pesticide spraying to such an extent that 50% of the financial outlay on cotton production was accounted for by pesticides.

　　In the early 1970s, the spraying frequently reached 70 times a season as the farmers were pushed to the wall by the invasion of genetically stronger insect species.

(编辑：罗伟)