—What's the price of the shirt?

—Two hundred dollars.

—I'm afraid ________.

A．the money is too much

B．the price is too expensive

C．the price is too high

D．your offer is too dear

处理一定流量的气体，采用（）净化时，耗用的能量为最小。

A.重力除尘装置。

B.惯性除尘装置。

C.离心力除尘装置。

D.洗涤式除尘装置。