请教:2016英语专八改错练习题二十二第1小题如何解答?
DDT, the most powerful pesticide the world had ever known,exposed nature’s vulnerability. Unlike most pesticides, which effect- __1__
DDT, the most powerful pesticide the world had ever known,exposed nature’s vulnerability. Unlike most pesticides, which effect- __1__
of nature of all insects are good, but if they are killed, things __8__go out of kilter right away.”
Developed in 1939, it first distinguished itself during the World War II, cleaning __3__
on DDT being conducted not far from which she lived in Maryland. __10__
South Pacific islands of malaria-caused insects for U.S. troops, while __4__in Europe being used as an effective de-lousing power.
Another was Rachel Carson, who wrote to the Reader’s Digest to propose an article about series of __9__tests
tiveness is limited to destroy one or two types of insects, DDT is __2__capable of killing hundreds of different kinds at once.
When DDT became available for civilian use in 1945, there were only a few people who expressed the second thought about this __6__new miracle compound.
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