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  3. DDT, the most powerful pesticide the world had ever known, exposednature’s

DDT, the most powerful pesticide the world had ever known, exposednature’s

游客2024-11-07  20
问题     DDT, the most powerful pesticide the world had ever known, exposed
nature’s vulnerability. Unlike most pesticides, which effectiveness is limited 【M1】______
to destroy one or two types of insects, DDT was capable of killing hun- 【M2】______
dreds of different kinds at once. Developed in 1939, it first distinguished
itself during World War II, cleaning South Pacific islands of malaria- 【M3】______
caused insects for U.S. troops, while in Europe being used as an effective 【M4】______
de-lousing powder. Its inventor was awarded by the Nobel Prize. 【M5】______
    When DDT became available for civilian use in 1945, there were only
a few people who expressed the second thoughts about this new miracle 【M6】______
compound. One was nature writer Edwin Way Teale, who warned, ""A spray
as discriminate as DDT can upset the economy of nature as much as a revo- 【M7】______
lution upsets social economy. Ninety percent of all insects are good, but if 【M8】______
they are killed, things go out of kilter right away."" Another was Rachel Car
son, who wrote to the Reader’s Digest to propose an article about series of 【M9】______
tests on DDT being conducted not far from which she lived in Maryland. 【M10】______
The magazine rejected the idea. [br] 【M1】
选项
答案 which — whose
解析 whose在这里作关系限定词，与effectiveness构成名词词组在关系分句里作主语。whose的先行词既可以是人，也可指物或抽象概念，如：I saw some trees whose leaveswere black with disease．当whose指具体事物或抽象概念时，能与of which结构互换使用，但前者更普遍，如：This is an idea whose origin is to be found in Green philosophy．This is an idea the origin of which is to be found in Greek philosophy．
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