题目

— It’s 9:00 pm. Is the shop ______now?    — No, it’s _______ .          A. open; close           B. closed; open      C. open; closed      D. close; open 答案：C一次函数y=ax+b在直角坐标系中的图象如图所示，则化简的结果是（ ）A. 2a B. －2a C. 2b D. －2b