单项选择题

The sun warms the earth, ______ makes it possible for plants to grow.

A．this
B．that
C．as
D．which
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单项选择题
It is dangerous to ______ out of the window of the train.
A．look
B．lean
C．bend
D．slope
单项选择题
Only in a few countries ______ enjoy a reasonable standard of living.
A．do the whole of the population
B．the whole of population can
C．can the whole of the population
D．does the whole of the population
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