单项选择题

A．They are usually very high.
B．They are always very low.
C．they can be very different.
D．They are actually the same.
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单项选择题
A．They are impossible to guide.B．They may go up in flames.C．They tend to leak gas.
A．They are impossible to guide.
B．They may go up in flames.
C．They tend to leak gas.
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