The U.S.will come to lose its leading place in technology probably becauseA．the number of
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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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正确答案：B
细节题。短文一开始点明主题，美国将逐渐失去它在技术方面的领先地位，原因是科学家和工程师在数量上双双减少，接下来分析了减少的原因。B为正确答案。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。