单项选择题

Bicycling and jogging are good exercise to train one’s heart because they______.

A．require a lot of strength
B．are more interesting
C．can reduce one’s weight
D．bring one’s heartbeat to at least 120 a minute
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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
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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