单项选择题

A．It is noisy.
B．It cannot fly as fast as most planes.
C．It has a small rotor on its tail.
D．It is small.
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单项选择题
A．Small and lightweight.B．Solid and heavy.C．Bulky but weightless.D．Large but necessary.
A．Small and lightweight.
B．Solid and heavy.
C．Bulky but weightless.
D．Large but necessary.
单项选择题
A．He has a headache.B．He failed his history exam.C．He is sleepy.D．He is too busy.
A．He has a headache.
B．He failed his history exam.
C．He is sleepy.
D．He is too busy.
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