户口必须在本社区办理的事项：（）
A、残疾证
B、60岁老年证
C、65岁老年优待卡
D、养老助残券
参考答案：A
The teacher had a _______ look when he found that none of his students had finished his homework.
A．shocking
B．shocked
C．bored
D．boring
在使用中发现管道或暖气片漏水，应采取的应急措施有哪些？
