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.
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单项选择题
A．War.B．Human and Nature.C．Mass media.D．Anti-terrorism.
A．War.
B．Human and Nature.
C．Mass media.
D．Anti-terrorism.
单项选择题
A．By a 77-year-old woman.B．By advertising in newspapers.C．By neighborhood group meetings.D．On television.
A．By a 77-year-old woman.
B．By advertising in newspapers.
C．By neighborhood group meetings.
D．On television.
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