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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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 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.