14、（2018•呼和浩特）There are so many foggy days recently．We all wonder_________．
A．how is the air polluted
B．why the air is seriously polluted
C．what can we do to prevent that bad weather
D．what are the real reasons
14.B【解析】最近有这么多雾天．我们都想知道为什么空气污染如此的严重．
根据We all wonder--再结合选项，可知We all wonder后面是跟一个宾语从句，宾语从句中应该用陈述语序，即主语+谓语，所以排除ACD．选项Bwhy the air is seriously polluted为什么空气污染如此的严重，符合题意．故选：B．