单项选择题

Recently, great advances have been made in the study of Mars' surface by the use of radar waves to ______ the dense cloud layer.

A．hover
B．pierce
C．penetrate
D．plunge
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单项选择题
He had to cancel his lunch date, as it ______ with his hospital appointment.
A．coincided
B．collaborated
C．overlapped
D．collided
单项选择题
According to the passage, the best solution to the conflicts between old and young is ______.
A．teaching the young to respect the old
B．dividing the society along power grades
C．recognizing ability and rewarding it fairly
D．reminding the old that the young is capable
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