题目

Lily’s fond of       travelling and she always keeps       travel journal of what she does each day during her trip.        A. the; the             B. /; the               C. the; a                 D. /; a  答案：D（2007•天津）已知二次函数y=ax2+bx+c（a≠0）的图象如图所示，有下列5个结论：①abc＜0  ②b＜a+c  ③4a+2b+c＞0  ④2c＜3b  ⑤a+b＞m（am+b），（m≠1的实数）其中正确的结论的有（ ）A．2个B．3个C．4个D．5个