Ｑ２．How long do you use smartphone or cell phone?
 | I am surprised to 20% students use them more than 3 hour. When do they study? |
 | I have a friend who can’t stop using smartphone. Come to think of it, I always see the walking people with they use smartphone. |
 | The more I use, the more I get worry such as my smartphone is infected with a virus or I receive junk mail. |
| Let’s think it later and go next! |
