单项选择题
21（）
A．sleep
B．bad
C．cold
D．sick
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单项选择题
In fact, it has just a history of ______.
A．less than two hundred years
B．more than a hundred years
C．less than a century
D．nearly a century
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单项选择题
People gave Up gold and silver coins because ______.
A．they were too heavy
B．they would be for future use
C．they were easy to slip off
D．they were useless
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