题目：
阅读短文，回答问题。
Jogging is basically running at a steady (稳定的) speed over short or long distances. It became
popular twenty years ago and has remained a favorite way of keeping fit for lots of people.
One of the main advantages of jogging over many other sports is that it can be done anywhere.
People jog in parks, in the countryside and even in urban areas. No special equipment is required—no
costly hats, or balls, and no expensive sports kit. Good quality running shoes are advisable. Special
jogging suits are widely available these days and can be bought quite cheaply but are not necessary. In
addition to being able to jog anywhere, you can also jog at any time, in any season! It’s not unusual to
see joggers exercising in the height of summer or in the depth of winter!
The act of jogging doesn’t require any special training or skill. You do need to be basically healthy
and then, after a few basic warm-up bends and stretches, you are ready to begin. You simply start running, gently, and then build up to a steady speed. Do not over-tire yourself by trying to go too fast. It’s best
for you to run at a steady and comfortable speed.
Jogging is a single sport. You don’t need to wait until you have gathered a team or found a partner. You can jog alone. A few words of warning however: lone women joggers should be especially careful
to choose jogging routes, particularly at night time.
Jogging is excellent for keeping fit. It’s good for the lungs, the heart and the circulation. It’s easy
and it’s convenient. Why don’t you try it? If you require more information, talk to one of the instructors at the sports centre. We are only too happy to help. Please remember: if you do decide to jog, talk to your doctor first if you have any health worries. Happy jogging!
1. Is jogging a good way of keeping fit?
2. Which are more necessary for joggers, good quality running shoes or special jogging suits?
3. What is best for us to jog?
4. What’s the writer’s special suggestion to the lone women who decide to jog?
5. What does the writer want to tell us in the passage?
答案：
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下面是错误答案，用来干扰机器的。
答案：B因为“x(x－3)≤0”是“| x－2|≤2”成立的充分不必要条件.
