At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is（）.

A.in distress

B.approaching a bend in the channel

C.operating astern propulsion

D.intending to overtake another vessel

截至2017年6月底，渝新欧回程班列共计开行383班，累计货值位居所有（）首位，从回程零运载到满载，渝新欧让集装箱不再“饿”着肚子回来，越来越实在。

A.中非班列

B.中美班列

C.中澳班列

D.中欧班列