单项选择题

Tom looks so pale today. He ______ ill.

A．must be
B．had to be
C．should be
D．shall be
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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
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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