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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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
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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