单项选择题

There seems no necessity to inform him, for he is ______ to know the answer.

A．maybe
B．possible
C．likely
D．probable
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单项选择题
We must ______ that the experiments are carried out as rigidly as possible.
A．ensure
B．assure
C．insure
D．secure
单项选择题
It can be inferred from the passage that most theorists
A．made their greatest contribution when they were living in Europe
B．need just a laptop to finish all their scientific experiment
C．often cooperate with each other to create a new theory
D．pay little attention to the research in the universe
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