帝都不适合人类居住？

[![](http://photo1.bababian.com/upload9/20080322/380758C855590323884B5EB47CCEE5C2_500.jpg)](http://photo1.bababian.com/upload9/20080322/380758C855590323884B5EB47CCEE5C2.jpg)

二环外是北京么？