若一个多边形的内角和与它的外角和相等,则这个多边形是( ) A.三角形 B.四边形 C.五边形 D.六边形 答案:BThe moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.【广东省高州七中2010-2011学年高三第六周抽考】【动词短语】 A.set off B.set down C.set aside D.set about