题目

My brother _______ football quite well, but he hasn’t played since last year.   A. will play  B. has played  C. played  D. plays 答案：D 解析: 略已知⊙A和⊙B相切，两圆的圆心距为8cm，⊙A的半径为3cm，则⊙B的半径是（ ）A．5cmB．3cm 或11cmC．3cmD．5cm或11cm