单项选择题

A．The Helicopter.
B．The Advantages of the Helicopter.
C．The Disadvantages of the Helicopter.
D．The Uses of the Helicopter.
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单项选择题
A．Because his watch has stopped.B．Because his watch is slow.C．Because his watch is fast.D．Because his watch is lost.
A．Because his watch has stopped.
B．Because his watch is slow.
C．Because his watch is fast.
D．Because his watch is lost.
单项选择题
A．13 million.B．30 million.C．14 million.D．40 million.
A．13 million.
B．30 million.
C．14 million.
D．40 million.
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