单项选择题

The phrase "stumbling block" may best refer to ______.

A．obstacle
B．motivation
C．acceleration
D．deceleration
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单项选择题
By the first sentence of the passage the author means the US scientists______.
A．at large
B．at best
C．well-paid, but less productive
D．well-funded, but less informed
单项选择题
What is said in the passage may best be concluded as ______.
A．a sub-optimal approach to career development
B．a coherent and credible point of view much needed
C．no money offered to sympathetic politicians
D．academic voice versus industrial interests
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