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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单项选择题
She is going to have _________ X-rays examination this morning.
A．a
B．an
C．the
D．some
单项选择题
John has to prepare the mathematic examination _________.
A．he can as best
B．best as he can
C．as he can best
D．as best he can
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