单项选择题

The passage primarily discusses the pipeline's _________.

A．operating costs
B．employees
C．consumers
D．construction
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单项选择题
She decorated the room _________ good taste.
A．in
B．on
C．at
D．with
单项选择题
With the development of modern science and technology, a manned trip to Mars should be _________.
A．potential
B．thoughtful
C．feasible
D．certificated
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