单项选择题

A．It takes a long time to melt.
B．It is lighter to carry.
C．It is not so cold as ordinary ice.
D．It is cleaner to use than ordinary ice.
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单项选择题
A．By their sense of sight.B．By their sense of hearing.C．By their sense of touch.D．By their sense of smell.
A．By their sense of sight.
B．By their sense of hearing.
C．By their sense of touch.
D．By their sense of smell.
单项选择题
A．Exciting.B．Rewarding.C．Disappointing.D．Exhausting.
A．Exciting.
B．Rewarding.
C．Disappointing.
D．Exhausting.
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