____ at a college or university in the USA, Chinese and other international students must demonstrate a strong ability in spoken and written English.

A．Having been accepted

B．To be accepted

C．Being accepted

D．Accepted

等标污染负荷考虑了污染物的（）。

A.排放量

B.慢性毒作用阈浓度

C.排放标准

D.排放量和慢性毒作用阈浓度

E.排放量和排放标准