请你用Shopping Online为题写一篇文章，说说你的看法：人们为什么喜欢网上购物，网上购物有哪些优点和缺点。 （80词左右。）
Today, people are busy with their work and study and have little time to go shopping.
So shopping online has become an important part in their lives. It is convenient and we can save much time. Besides, with all the traffic problems in cities, going shopping is not an easy thing. Just sit at a computer, click and choose, you can find all kinds of different things online. You can also compare with the prices. So you can buy something you like but not expensive.
However, shopping online can bring you some trouble. Sometimes, you will find that the things you get are different from those you can see online. And, the quality of the things are not so good. Even, you will be cheated by others.
So we should be careful to shop online.