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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!

参考答案

参考答案。A具有强干扰性,但不是博士生总量少了,而是从事科学和工程方面的博士生少了,故应排除。

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