—What’s your favorite sport?

—Swimming. I think it’s _______.

[ ]

A. easier  

B. more difficult

C. the most interesting

D. the most boring

下列情况下（），会使电杆或铁塔折断或倒塌、沉陷。

A.干旱

B.大面积雾霾

C.洪水涝灾

D.狂风暴雨