上游来水COD_Cr（p）=14.5mg/L，Q_p=8.7m3/s；污水排放源强COD_Cr（h）=58mg/L，Q_h=1.0m³/s。如忽略排污口至起始断面间的水质变化，且起始断面的水质分布均匀，则起始断面的COD_Cr浓度是（）。

A.14.5mg/L

B.19.0mg/L

C.25.0mg/L

D.36.3mg/L

----- When does your plane take off?

----- At 3:00 p.m. tomorrow, I’ve just called the airport to ____it.

A．argue

B．confirm

C．organize

D．intend