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
Which of the following is used to support the claim that the emperor died of a natural death
A．He had a good appetite for various kinds of food.
B．He had a habit of drinking little and mixed it with water.
C．He had lost 11 kilos during the last five months of his life.
D．He was deported to the island of St Helena.
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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