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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  25
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] 【M4】
选项
答案 caused — causing
解析 动词的-ed分词和-ing分词作名词修饰语时，-ed分词表示的是动词和所修饰名词间的被动关系，而-ing形式表示的则是主动关系，此句中malaria-causing insects相当于in-sects that caused malaria，因此是主动关系，所以应选择一ing形式。详细说明请参照本书第37页关于动词的-ed分词和-ing分词区别的解释。
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