单项选择题

Science is the systematic _________ of knowledge using nature itself or laboratory models and experiments.

A．pursuit
B．acquisition
C．exploitation
D．survey
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单项选择题
Recently, great advances have been made in the study of Venus' surface by the use of radar waves to _________ the dense cloud layer.
A．pierce
B．penetrate
C．plunge
D．persecute
单项选择题
I had been puzzled over the problem for over an hour without any result when all at once the solution _________ across my mind.
A．flickered
B．flared
C．flushed
D．flashed
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