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
单项选择题
By mentioning the case of Harvard football players, Dr. Mirkin meant that ______.
A．too much exercise often leads to a shorter life span
B．American football is too violent to be good for one’s health
C．to exercise when one is young doesn’t guarantee a good health when one is older
D．Harvard students are physically inferior to students from other universities
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