Every day, in all kinds of weather, a lot of men and women go jogging (running slowing). 小题1:为什么慢跑这么流行呢？ Most people start jogging because they hear it is a very good form of exercise. 小题2:Jogging makes the heart strong and helps people control their weight. If you keep jogging every day, 小题3:你不必通过吃药来减肥。Jogging can also make you feel better about yourself.

Do you jog? If you do, 小题4:一定要向医生询求建议。Does jogging cost much? It costs almost nothing. But it is very important to have a good pair of shoes that are made for jogging. 小题5:If not, when you run on hard ground for a long time, it may cause your feet to hurt.

电路由哪几部分组成各部分在电路中起什么作用？