单项选择题

The first two problems are very difficult, but the rest ______ easy.

A．is
B．are
C．has
D．have
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单项选择题
Light is different ______ sound ______ the way it travels.
A．in, from
B．of, to
C．by, for
D．from, in
单项选择题
The advisers propose that the plan ______ postponed for a few weeks.
A．been
B．to be
C．be
D．being
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