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问题

The U.S.will come to lose its leading place in technology probably becauseA.the number of


The U.S.will come to lose its leading place in technology probably because

A.the number of PhD degree holders is declining.

B.the number of scientists and engineers is decreasing.

C.the number of 22-year-olds is declining.

D.scientists and engineers are not employed.

请帮忙给出正确答案和分析,谢谢!

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