狭义的社会保障属于政府层面，通常由政府来组织和管理，为个人和家庭提供最基本的经济保障。
参考答案：对
Complete the conversation. （完成对话。）
Marie: Hello! May I speak to Karen?
Karen: Hello! This is Karen. How are you, Marie?
Marie: I’m fine. What ______(do)?
Karen: Nothing much. I ______(study)math. What about you?
Marie: I _______(clean)my room.
Karen: Hey, do you want to ______(go)to the movies?
Marie: That _______（sound）boring.
Karen: I just call Lucy. She ________(swim). Do you like _______(swim)?
Marie: Sure. We can swim in the school’s swimming pool. When do you want to go?
Karen: Let’s _______(go)to the swimming pool now.
Marie: Great!
GSM系统的安全措施有：（）
A、鉴权
B、加密
C、用户识别码的保密
D、SIM卡的安全
