单项选择题


A．Unfortunately
B．Specially
C．Naturally
D．Usually
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单项选择题
Helicopters are set to motion by means of______.
A．one rotating fan in the centre of the aircraft and others at each end
B．a rotating fan underneath for lifting
C．a rotating device on top
D．a combination of rotating devices in front and on top
单项选择题
The author thinks that the conclusions of any research about people's state of mind are______.
A．surprising
B．confusing
C．illogical
D．questionable
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