单项选择题

It has been estimated that the earth's surface temperature has increased ______ one quarter to three fourths of a degree since 1850.

A．by
B．at
C．to
D．with
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单项选择题
With the gradual improvement of transportation and communications, farmers have now had easier ______ to cities and towns.
A．access
B．reach
C．approach
D．touch
单项选择题
Most people have come to realize that it is about time the government ______ further measures to control the population.
A．must take
B．is taking
C．takes
D．took
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