题目内容：

Walking is so simple and convenient that it couldn’t possibly count as exercise, right? Wrong．Study after study shows that regular walking can help you lose weight and reduce your risk of heart disease．

The study published in Diabetes Research and Clinical Practice shows that the blood pressure of the overweight men being tested improved and the amount of body fat greatly decreased．

That’s good news, because walking has now become the most popular fitness activity in the United States．Convenient, simple, and gentle on the joints, walking is perhaps the easiest form of exercise to maintain．According to a survey, four out of five women who start a walking program continue to walk, while half of women who attempt other types of aerobic exercise(有氧运动), such as swimming, drop out during the first few months．

Here are some basics for walking exercise．

Walk at a pace that makes you breathe heavily, but still able to talk．

Your goal, first and foremost, is to walk five days a week, 30 minutes a walk．Do that, and you are getting the base-level amount of exercise that research says should maintain your health and vigor(精力)．

Walk for as long as you are comfortable the first week, even if it is just to your mailbox and back．Each following week, increase that amount by no more than 10 percent．

Start every walk with five minutes of easy-paced walking, about the same pace at which you do shopping, to get your body warmed up．Then, cool down at the end of each walk with another five minutes of easy-paced walking．This allows your heart rate to gradually speed up and slow down．

1.The survey mentioned in Paragraph 3 shows that ________．

A. 80％ of the women surveyed are walking as a means of exercise

B. 50％ of the women surveyed want to swim as a means of exercise

C. walking is more easily maintained than other types of aerobic exercise

D. the effect of walking is as good as that of other types of aerobic exercise

2.Which of the following statements is TRUE about walking for exercise?

A. Walking five days a week, 30 minutes altogether, is the goal．

B. Increase at least 10％ of the amount of each previous week．

C. Each walk should start with the pace of doing shopping．

D. Walking as much as you can in the first week is suggested．

3.What is the purpose of the easy-paced walking in every walk?

A. To help reduce your blood pressure．

B. To help reduce your risk of heart disease．

C. To help your body lose fat．

D. To help your heart rate change gradually．

4.What would be the best title for the passage?

A. How to Keep Healthy?

B. Walking for Exercise

C. Different Ways of Exercise

D. Is Walking a Type of Exercise?