選B
因?yàn)椋簍hrough 作介詞時(shí)多指從中穿過(guò),通過(guò),walk through the forest,send the message through email；是從一頭（邊）貫穿到另一頭（邊）.例The river runs through our city.He passed through the hall.
across 是指在表面上掠過(guò),穿過(guò),如 walk across the bridge,fly across the moutain,
還有對(duì)面的意思,如across the road ,
與“道路”交叉形成“十字”,go across the street
因此,本題選B.
祝進(jìn)步.