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
He has brought forward conclusive evidence, which______ for further dispute.
A．makes room
B．leaves no room
C．spares no efforts
D．takes no pains
单项选择题
He wanted to ask her to marry him but he was too shy to do it at once. He ______ by saying he often felt lonely.
A．led up to it
B．took it up
C．made it up
D．gave it away
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