I want to know____________.

A．when will he come

B．would he like to go shopping with me

C．if he had been back

D．why he is so angry

我国各地区导致贫困的主要环境因素有（）。

A．高海拔地区的寒冷气候

B．西南地区降雨集中导致的洪水和其他地质灾害

C．坡地和植被稀少导致的土壤流失

D．西北地区少雨和严重干旱

E．南方地区多雨和严重涝灾