单项选择题

Mike fitted a new lock to _______ that the bicycle would not be stolen.

A．ensure
B．insure
C．assure
D．sure
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单项选择题
He was _______ very nervous and for some minutes stood awkwardly before the microphone.
A．evidently
B．seemingly
C．apparently
D．obviously
单项选择题
The atmosphere _______ of certain gases mixed together in definite proportions.
A．consists
B．comprises
C．composes
D．constitutes
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