— Any advice about this trip?

— Well, no food is available on _____ island so make sure you bring _____ packed lunch and drink, as well as your camera and sunblock.

A．an, the

B．the; a

C．the; /

D．an; a

在肾盂造影时，如压力过高可出现造影剂逆流，以下错误的是（）

A.肾小管回流

B.肾窦回流

C.血管周围回流

D.淋巴管回流

E.输尿管回流