Paragraph 6_______A.Man should be cautious in che
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Paragraph 6_______
A.Man should be cautious in chemical use.
B.It takes generations for mankind to adapt themselves to the chemicals.
C.Chemicals are human’s invention
D.Human’s power increases and has changed its character in the past quarter century.
E.The new change in the relationship between earth and its creature一human’s power playing a greater role in changing the world
F. Modern world gives no time for nature to adjust to human.
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答案：A
本题考查的是对所读材料大意与主旨的掌握。第六段通过两个“I (do) contend”引出对于人类错误使用化学物质并对此疏于监管表示担忧。选项A是答案，因为 " Man should be cautious in chemical use.”人类应该小心使用化学物质，概括了本段的大意。