—Could you tell me something about the boy who helped you just now?

—Sorry, I know nothing about him. We are __________ .

A．friends

B．neighbors

C．classmates

D．strangers

属于环境保护法律法规体系的是( )。

A．环境保护综合法

B．生态环境状况评价技术规范

C．《中华人民共和国环境影响评价法》

D．电磁辐射环境影响评价方法与标准