计算 的结果是（　　）.

手机扫描二维码，相当于给二维码照了一张照片，如图是手机扫描物品上的二维码，登录网址、查看物品相关信息，下列说法中正确的是（　　）

    I'm Lucy. I have a happy family. There are four people in my family. My birthday is on January 1st. It's New Year's Day, too. My family and I will have a big dinner on that day. I have a little brother. He is four years old. His birthday is in winter. It's very cold but we can make a snowman. My mother's birthday is in March. My father's birthday is in March，too. We can plant trees and fly kites.

防火、灭火、自救等安全知识是每个人都应该了解的生活常识，下列做法错误的是（　　）