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．persecute
B．pierce
C．penetrate
D．plunge
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My sister said that she would work out the problem herself______ ask my brother for help.
A．yet not
B．but not
C．and not to
D．rather than
单项选择题
The rising crime rate has become major concern of______ society.
A．the, the
B．a, /
C．/, the
D．a, a
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