题目

If our parents do everything for us children, we won’t learn to depend on _________.A．themB．usC．themselvesD．ourselves 答案：D解析: 略用两张全等的矩形纸片分别卷成两个形状不同的柱面(圆柱的侧面)，设较高圆柱的侧面积和底面半径分别为S1和r1，较矮圆柱的侧面积和底面半径分别为S2和r2，那么A.S1＝S2，r1＝r2B.S1＝S2，r1＞r2C.S1＝S2，r1＜r2D.S1≠S2，r1≠r2