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单项选择题

Why did the narrator go past Sheftel's

A．He was looking for a gift for his niece.
B．He wanted to buy some stationery.
C．He was on his way to work.
D．He was window-shopping.

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单项选择题The step-test was given ______.

A．at the beginning and at the end of the 7-week period
B．after each exercise period
C．only at the beginning of the 7-week period
D．only at the end of the 7-week period

单项选择题When were pulse rates taken

A．After every exercise period.
B．Every time the ratio of active riding was increased.
C．Every day.
D．After each step-test.

单项选择题How many people were in each group

A．100.
B．25.
C．50.
D．15.

单项选择题What does this paragraph imply

A．Most of us don't get enough exercise.
B．We should exercise 15 minutes per day.
C．A high pulse rate is more healthy.
D．Regular exercise can strengthen our heart.

单项选择题What did Group A do in their program

A．They stepped up and down on a bench every day.
B．The didn't do any exercise.
C．They rode on an exercycle every day.
D．They pushed handle bars every day.