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1最佳选择题 3分

Within80yearssomescientistsestimatetheworldmustpro

A. Though the situation is not urgent, we should press forward with our marine research.
B. Nations throughout the world must be provided with fish, fresh or frozen, for needed protein.
C. There are enough fish in the U. S. seas to allow for the annual protein needs of a quarter of the world’s 5 billion people.
D. The oceans are the major source of the world’s protein supply.

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2最佳选择题 3分

Within80yearssomescientistsestimatetheworldmustpro

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3最佳选择题 3分

Within80yearssomescientistsestimatetheworldmustpro

A. the sea is an inexhaustible resource of food supply.
B. the shortage of food supply mainly results from unrestricted population growth.
C. the inadequate food supply is chiefly caused by the negligence in exploration of the sea.
D. it is the population projects, rather than the development of sea resources, that can improve the nutritional conditions of mankind.

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4最佳选择题 3分

Within80yearssomescientistsestimatetheworldmustpro

A. the seas we will depend on for future food have been more or less contaminated.
B. the marine resources are directly hound up with our future life.
C. the exploitation drives are essential for us to improve the quality of life on the earth.
D. the ecological balance in the seas has nothing to do with that on the land.

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5最佳选择题 3分

Within80yearssomescientistsestimatetheworldmustpro

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