题目

把一个底面周长是6.28分米，高5分米的圆柱体的侧面沿高剪开得到一个长方形，这个长方形的长是分米，宽是分米。 答案：【1】6.28【2】5 The recent earthquakes have caused concern because they happen _____ population centers and have caused huge damage. A. to be hit                          B. hitting                      C. having hit                 D. to have hit