问题
单项选择题
A figure that can be folded over along a straight line so that the result is two equal halves which are then lying on top of one another with no overlap is said to have a line of symmetry. Which of the following figures has only one line of symmetry
A．Square
B．Circle
C．Equilateral triangle
D．Isosceles triangle
E．(E) Rectangle
答案
参考答案：D