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
Soon after the disaster, thousands Of bodies of the victims were buried in an effort to the epidemic disease.
A．lay off
B．call off
C．ward off
D．wear off
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