单项选择题

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

A．do away with
B．put up with
C．come up with
D．go along with
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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
单项选择题
A．behindB．in the front ofC．aheadD．after
A．behind
B．in the front of
C．ahead
D．after
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