．—________the population of Shandong Province?

—I can't say exactly, but I know it ________ about 80 million.

A．What's; has large population

B．How much is; has the population of

C．How many is; has a large population

D．What's; has a population of

调整好水表叶轮顶尖高度，是消除水表（）的方法之一。

A、走快

B、走慢

C、时走时停

D、倒转