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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单项选择题
Weather______ , the students of Class Two will have a picnic this Sunday.
A．permits
B．permitted
C．will permit
D．permitting
单项选择题
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
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