单项选择题

It is said that somewhere between the ages of 6 and 0, children begin to think______ instead of concretely.

A．logically
B．reasonably
C．abstractly
D．generally
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As a developing country, we must keep______ with the rapid development of the world economy.
A．move
B．step
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With the explosion of population, scientists will have to______ new methods of increasing the world's food supply.
A．do away with
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