no changes occurred in the nonwalking control group.
The experts noted that the degree of positive change in blood pressure and waist and hip size seen in the 3day and 5day walkers is enough to make a difference to an individual's risk of heart disease.
“These results may encourage people who feel they do not have time to exercise for 5 days each week to consider finding time to do a lower weekly target of exercise, ” Tully and his colleagues concluded.
31.What's the main purpose of the article?
A.To encourage people to do some exercise,
even at a low level. B.To encourage people to do as much exercise as possible.
C.To remind sedentary adults to do some exercise.
D.To tell people how to improve overall fitness.
32.Why only few people can do 30minute exercise for five days of the week?
A.They can't find the time.
B.They will be too tired.
C.They will have heart attacks.
D.The level of the exercise is too high for them.
33.Which of the following is WRONG about the study?
A.The participants are all healthy but sedentary adults.
B.The participants are all over 40 years old.
C.The participants do a 30minute walk 3 days a week and a 3minute walk 5 days a week in every two weeks.
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