易发生持续性枕后位的骨盆是
A．女型骨盆
B．骨软化症骨盆
C．均小骨盆
D．男型骨盆
E．扁平骨盆
参考答案：D
同一只鸡的平均蛋重在产蛋期中的（）最大。
A、初产期
B、高峰期
C、产蛋后期
D、产蛋末期
This is ______ classroom, and ______ in front of the library. [ ]
A. we; its
B. our; its
C. our; it's
D. we; it's
