单项选择题

A．To make sure you are standing firmly enough at the shore.
B．To make sure you are properly equipped.
C．To make sure you are properly grounded at the shore.
D．To make sure you are properly grounded off the shore.
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单项选择题
A．Half an hour.B．Longer than half an hour.C．Longer than an hour.D．It depends on different people.
A．Half an hour.
B．Longer than half an hour.
C．Longer than an hour.
D．It depends on different people.
单项选择题
The research findings report commercial rather than political trends.
A．Y
B．N
C．NG
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