单项选择题

A bottle weighs more after air is put in. proves that air has weight.

A．We
B．Which
C．It
D．What
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单项选择题
When to zero degree centigrade, water will be changed into ice.
A．cooled
B．being cooled
C．having cooled
D．cooling
单项选择题
There are three young people in our group. of them are girls.
A．No one
B．All
C．Either
D．Both
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