题目

 实数、在数轴上的位置如图所示，则化简的结果为(  *   ) A. -    B.       C .         D. 第11题图     答案：D解析:略 15、----How long are you staying? ----I don't know.___________. A. That's OK       B. Never mind   C. It depends      D.It doesn't matter