The settlement is home to nearly 1,000 people, _____ left their village homes for a better life in the city.

A．many of those

B．many of which

C．many of them

D．many of whom

离心泵若改用前弯叶片会使（）提高。

A．液体在叶轮出口的压力能

B．液体在叶轮出口的动能

C．泵的允许吸上高度

D．泵的效率