A:How was your last summer holiday?
B:How did you go there?
It's difficult for the boy ________ to school.
元朝是我国第一个统一全国的少数民族政权,下列事件发生在元朝的是 ( )
①铁木真统一蒙古 ②马可·波罗来华
③回族形成 ④经济重心南移完成
⑤建立行省制度
读欧洲西部区域图,完成下列各题: