D．Both the 3­day walkers and 5­day walkers improved their health conditions.

　　34．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.

　　Ⅳ.补全对话

　　根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项多余选项。

　　—We hear so much about exercises these days. So even experts can't agree on which exercises are best. Now some doctors are strongly encouraging arm exercises.

　　—Arm exercises？__35__

　　—__36__They say that arm exercises are a way to become physically healthy.

　　—But don't arm exercises raise your blood pressure？

　　—Yes. But the articles I read supply ways to make up for that.

　　—How？

　　—By adding leg exercises， so that the arms don't do all the work.

　　—__37__

　　—Sounds right to me. I quite agree with you.

　　—__38__

　　—They mentioned quite a few， but some of the popular ones are cycling with special bicycles that make you use both your arms and legs.

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