保温瓶瓶胆内壁涂有水银，主要是为了防止( )。
A．热的蒸发
B．热的传导
C．热的辐射
D．热的对流
参考答案：C
根据中文提示完成下列句子。
1. What is your ___________ (地址)?
2. There are ___________ (很多) shops in the city.
3. Sometimes I ___________ (想念) my mother.
4. Don't ___________ (忘记) the stamp.
5. I go to Canada in ___________ (二月).
两肩怎样才能沉着虚灵？
