往复泵、活塞泵、螺杆泵、齿轮泵属于（）泵。
A、离心
B、滑片
C、容积
D、轴流
参考答案：C
John is much shorter than his sister, but he jumps_________she does.
A．as good as
B．as best as
C．as high as
D．as higher as
