题目

下列函数的图象位于第一、第三象限的是（） A . y=﹣x2 B . y=x2 C . y= D . y=﹣ 答案：CThe thief ran away as fast as he could ______ the policeman. A. in sight　　 B. within the sight of　　 C. within sight　　 D. at the sight of