单项选择题

From early youth, Karl Marx had ______ his memory by memorizing verses in an unfamiliar tongue.

A．ploughed
B．tamed
C．cultivated
D．farmed
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单项选择题
We all agree that computers are essential ______ the problems of increasing population.
A．to solve
B．to solving
C．solving
D．of solving
单项选择题
A large part of human activity, particularly in relation to the environment, is ______ conditions or events.
A．in response to
B．in favour of
C．in contrast to
D．in excess of
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