阅读下面材料，从所给的A－F六个选项中，选出正确的选项填空，使短文通顺、内容完整。
Smart wristband(智能手环), a new welcoming product, is changing our lifestyle. And there are also many different brands to choose, such as Apple or Huawei.
Here are the reasons why people choose a wristband.
The wristband can also be connected to the mobile phone. You are able to use it to answer the phone, but a traditional watch can never do that.
Besides, the smart wristband looks fascinating. We often see teenagers wearing wristbands.
Thirdly, at present many people have realized the importance of health. Some people play sports every day to keep healthy. The wristband shows the results every day and you'll know whether you achieve your aim or not. However, some parents are still against using it. They think the teenagers are under the radiation(辐射) all the time.
Each coin has two sides.Use it or not, it's up to you.
A. It's helpful to know how far they have run or how many steps they have got with a wristband.
B. First of all, it can tell the time like a normal watch.
C. In their opinion, wearing wristbands for a long time may cause cancer (癌症).
D. People don't need a normal watch anymore.
E. More and more people prefer to choose a smart wristband in their daily life.
F. It's very popular among teenagers because it's cool enough.
对话，回答问题。