问题
选择题
The global warming is more and more serious, for which human beings ______．
A．are blaming
B．are to blame
C．are going to blame
D．are to be blamed
答案
答案：B
考查短语。be to blame for 应受到责备。句意：全球变暖变得越来越严重了，人类应对此负责。