单项选择题

A．To attend lectures.
B．To buy birthday gift for Paul.
C．To prepare his speech.
D．To visit his classmates.
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单项选择题
A．70 dollars.B．49 dollars.C．21 dollars.D．12 dollars.
A．70 dollars.
B．49 dollars.
C．21 dollars.
D．12 dollars.
填空题
How has the use of helicopters developed
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