单项选择题

Lincoln, former president of the United States, is a conspicuous example of a poor boy who succeeded.

A．sturdy
B．obstinate
C．permanent
D．manifest
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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
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
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