月经来潮后子宫内膜再生来自：
A．致密层B．海绵层C．基底层D．功能层E．以上都不是
参考答案：C
若直线l与圆C：x2+y2-4y+2=0相切，且与两条坐标轴围成一个等腰直角三角形，则此三角形的面积为______．
—How are you going to the Summer Palace?
—We're going there bike. [ ]
A. for
B. at
C. of
D. by
