忘忧毛球
好处1. Riding bikes is helpful to build a healthy body.
2. It's good to enviornment because it does not cause air pollution.
3. It saves time in doing exercises.
4. It trains one's ability of keeping balance.
5. It helps to build muscles.
坏处
小火车君
Advantage1 It is good for the air,environment friendly.2 It is very cheap.It is cheaper than by car.3 You can do physical exercise,riding bike is good for your body and make you become healthier and healthier.4 Riding bike is very convenient,you can ride it in everywhere.
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