新建一座危险废物焚烧厂，该厂厂界位于居民区的距离正确的是( )m。
A．500
B．800
C．1000
D．3000
参考答案：D
He pictures of his family on the wall now . [ ]
A. put
B. puts
C. is putting
D.puted
环境污染：
