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发布时间:2023-10-23 13:00:32

[单项选择]Only (within) the past 200 years (scientists have) found (out what) fire (is).
A. within
B. scientists have
C. out what
D. is

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[单项选择]Only (within) the past 200 years (scientists have) found (out what) fire (is).


A. within
B. scientists have
C. out what
D. is
[单项选择]

Text 3
Within 80 years, some scientists estimate, the world must produce more than eight times the present world food supply. The productiveness of the sea raises our hopes for an adequate food supply in the future. Aided by men of science, we have set forth to find out
that 70 percent of the earth remains unexplored--the ocean depths. Thus, we may better discover and utilize the sea’s natural products for the world’s hungry.
It is fish protein concentrate that is sought .from the seas. By utilizing the unharvested fish in United States waters alone, enough fish protein concentrate can be obtained to provide supplemental animal protein for more than one billion people for one year at the cost of less than half a cent per day per person. The malnutrition of children is terribly tragic, But the crime lies in society’s unrestrained breeding, not in its negligence in producing fish powder. But wherever the population projects are caref
A. the seas we will depend on for future food have been more or less contaminated.
B. the marine resources are directly bound up with our future life.
C. the exploitation drives are essential for us to improve the quality of llfe on the earth.
D. the ecological balance in the seas has nothing to do with that on the land.

[单项选择]In the past ten years skyscrapers have developed ______ in Chicago and New York City.
A. homogeneously
B. simultaneously
C. spontaneously
D. harmoniously
[单项选择]During the past ten years there have been dramatic changes in the international situation.
A. permanent
B. powerful
C. striking
D. practical

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