枕先露临产过程，胎头下降程度的标志是（）
A.骨盆入口平面
B.坐骨棘连线
C.骨盆出口平面
D. * * 外口
E.坐骨结节连线
参考答案：B
By the time my mom _____ to our school, all others of my class ______ for home.
A．got, left
B．got, had left
C．had got, had left
D．had got, left
The President ________ giving military aid to this country.
A．is opposed
B．objects
C．opposes
D．against
