题目内容
7.听第10段材料,回答第17至20题.17.How many people are there in Group B?
A.25 B.45 C.65
18.When should the step-test be given to Group A?
A.After each exercise period
B.At the end of the exercise
C.At the beginning and the end of the seven-week exercise
19.What do Group A do in the experiment?
A.Step up and down on a bench every day
B.Do nothing
C.Ride on an exercise machine
20.What is the purpose of this experiment?
A.To see how many people would fail the exercise
B.To find out the effect of the exercise on people's heart-beating
C.To test whether the riding machine is strong enough.
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