单项选择题

A．five
B．two
C．six
D．four
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discouraging
单项选择题
A．It takes a longer time to melt.B．It is lighter to carry.C．It is cleaner to use than ordinary ice.D．It is not so cold as ordinary ice.
A．It takes a longer time to melt.
B．It is lighter to carry.
C．It is cleaner to use than ordinary ice.
D．It is not so cold as ordinary ice.
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