一．选择题：（每题3分，共30分）
1．下列图形中，不是轴对称图形的是······································································· （ ）
2.在平面直角坐标系中，点A(2，-3)在····································································· （ ）
A. 第一象限 B.第二象限 C.第三象限 D.第四象限
3.下列说法正确的是·································································································· （ ）
A．16的平方根是4 B．8的立方根是±2 C．-27的立方根是-3 D．＝±7
4.在-1.732、、、0.121121112…（每两个2中逐次多一个1）、-中，无理数的个数是 ( )
A．2个 B．3个 C．4个 D．5个
5.如果代数式有意义，那么x的取值范围是···················································· （ ）
A．x≥ −2 B． x > −2 C．x≥ − D．x > −
