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
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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
单项选择题
Because of air pollution, more and more people ______ live in the country ______ in the city.
A．would rather to ... than
B．would rather ... than
C．would rather ..: than to live
D．would rather to... than to live
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