单项选择题

A．Guarding the coasts of the United States.
B．Being part of the United States Navy.
C．Guiding people along the coast.
D．Protecting people from army attack.
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单项选择题
A．Enjoyable.B．Moving.C．Inspiring.D．Dull.
A．Enjoyable.
B．Moving.
C．Inspiring.
D．Dull.
单项选择题
The main difference between cordless phones and cellphones is that cordless phones can only operate in a limited range.
A．Y
B．N
C．NG
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