单项选择题

A．Harmful to people.
B．A weak point of shy people.
C．The cause of unhappiness.
D．A healthy characteristic.
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单项选择题
A．Heart.B．Lung.C．Liver.D．Brain.
A．Heart.
B．Lung.
C．Liver.
D．Brain.
单项选择题
When people began to celebrate Christmas, they was really in the habit of exchanging elaborate gifts.
A．Y
B．N
C．NG
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