2. 外语
  3. DDT, the most powerful pesticide the world had ever known, exposed nature’s vulnerability. Unlike most pesticides, which effecti

DDT, the most powerful pesticide the world had ever known, exposed nature’s vulnerability. Unlike most pesticides, which effecti

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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.
【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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