单项选择题

By such demarcation, strong, representative national societies can then be left to do what they do best -______ young scientists' development at national meetings, and represent their disciplines at the national level.

A．foster
B．founder
C．found
D．foul
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单项选择题
According to ______ across the relevant research community, the published attack represents an extreme position in its demands for proof.
A．soundings
B．echoes
C．sonar systems
D．reflections
单项选择题
The policy was technology transfer, embodied in the innovation chain with its three great links—invention, innovation, and______.
A．diffusion
B．diffidence
C．indifference
D．indigence
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