单项选择题

A compound consists of atoms ______ different chemical properties.

A．of
B．by
C．for
D．with
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单项选择题
The meeting had been ______ until next Sunday.
A．announced
B．transmitted
C．put aside
D．postponed
单项选择题
You can see a(n) ______ of dogs in the square.
A．plenty
B．amount
C．quantity
D．number
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