单项选择题

Those two ideas must be kept ______ one from the ether.

A．distinctive
B．distinguished
C．disguised
D．distinct
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单项选择题
The revival of the railroad service will be immensely ______ for the Speedy movement of passengers and cargo.
A．beneficial
B．profitable
C．beneficiary
D．proficient
单项选择题
I don't think her ability is in ______; what I question is her attitude.
A．debate
B．dispute
C．trouble
D．action
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