单项选择题

Research should continue on controlled nuclear fusion, but no energy program should be premised on its existence until it has proved practical.

A．focused
B．concentrated
C．agreed
D．based
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单项选择题
It could not be ruled out that, sooner or later, the country would break out of the treaty.
A．confirmed
B．tolerated
C．excluded
D．refuted
单项选择题
Now researchers are directing more attention to the social and cultural impetus that propelled university graduates into careers in management.
A．implication
B．propaganda
C．impulse
D．benefit
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