题目

Because of noise pollution,many teenagers can hear ________65-year-old people do. A.not better than  B.no better than  C.no well than    答案：B只用一种大小完全相同的正多边形地砖铺地时，判断能否作平面镶嵌（无缝不重叠）的依据是A.正多边形的材料B.正多边形的边长C.正多边形的对角线长D.正多边形的内角度数