单项选择题

Many countries face some serious problems of land use, ______ result from population growth and the demands of modem technological living.

A. which most
B. most of which
C. most which
D. of most which
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单项选择题
______, electrons are still smaller.
A. As atoms small are
B. As atoms smaller as
C. Small as atoms are
D. Smaller atoms as are
单项选择题
The fact remains ______ we are behind many others.
A. that
B. why
C. where
D. how
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