单项选择题

With the population explosion, scientists will have to ______ new methods of increasing the world's food supply.

A．come up with
B．carry out
C．lead to
D．stick to
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单项选择题
Only once in his life had Douglas permitted himself ______ control of his emotions.
A．to lose
B．lost
C．lose
D．losing
单项选择题
Language is a city, to the building of ______ every human being has brought a stone.
A．which
B．that
C．it
D．what
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