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
The telegraph opened up the possibility of establishing almost communication and thereby offered many practical advantages to people in all walks of life.
A．intermittent
B．instantaneous
C．remote
D．transient
单项选择题
The submarine cruising on the sea _________ when it detected the enemy planes.
A．immersed
B．drowned
C．converged
D．submerged
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