D.Both the 3day walkers and 5day walkers improved their health conditions.
39.What can we infer from the fifth and sixth paragraphs?
A.Walking can drive down blood pressure.
B.Even a low level of exercise in a week can improve one's heart health.
C.Walking can improve one's heart health.
D.Walking can make a difference to people's heart.
40.The text mainly tells us ________.
A.a study by Dr. Mark A. Tully
B.a study participated by 106 healthy but sedentary adults
C.to do as much exercise as possible
D.even a little exercise has health benefits
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