单项选择题

Disco dancing is an excellent exercise because ______.

A．the dancer keeps on moving vigorously
B．it is most popular among young people today
C．no other exercise can offer as much entertainment
D．it benefits the dancer both physically and spiritually
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单项选择题
The hair samples used in experiment ______.
A．came from INS which keeps the samples
B．were offered by the emperor’s descendents
C．were offered by the emperor’s servants
D．were taken directly from the emperor’s body
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