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
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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
单项选择题
Sometimes the tension produced by fears is so great that we cannot suppress it. At such times we need to _________ the tension by laughing or crying.
A．disperse
B．discard
C．disguise
D．discharge
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