单项选择题

A．five
B．two
C．six
D．four
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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.
单项选择题
A．He must meet his teacher.B．He must attend a class.C．He must go out with his girlfriend.D．He must stay at school to finish his homework.
A．He must meet his teacher.
B．He must attend a class.
C．He must go out with his girlfriend.
D．He must stay at school to finish his homework.
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