下列哪项归属于基金投资运作环节的业务（）。

A.基金的交易

B.基金的绩效衡量

C.基金的资产估值

D.基金的会计核算

. —How’s your tour around the North Lake? Is it beautiful?

—It __________ be, but it is now heavily polluted.

A．will

B．would

C．should

D．must