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

Businessmen make most of their income from profit（）by producing and selling products.

A．earning
B．is earned
C．earn
D．earned

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

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