题目

Columbus discovered America but did not (探索) the new continent. 答案：【1】explore把（+5）﹣（+3）﹣（﹣1）+（﹣5）写成省略括号的和的形式是（　　）A. ﹣5﹣3+1﹣5 B. 5﹣3﹣1﹣5 C. 5+3+1﹣5 D. 5﹣3+1﹣5