单项选择题

The number of cell phones ______ increased dramatically in the past few years.

A．have
B．are
C．has
D．is
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单项选择题
The sports meeting ______ next Saturday.
A．is to hold
B．is holding
C．holds
D．is to be held
单项选择题
Cotton output was ______ than last year.
A．20 percent high
B．20 percent higher
C．20 percent highest
D．higher 20 higher
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