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.
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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.
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