在肾盂造影时，如压力过高可出现造影剂逆流，最常见的是（）
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
参考答案：A
Suddenly we felt the _________atmosphere grow tense as neither of the sides would give in.
A．atmosphere
B．state
C．situation
D．phenomenon
The good thing about children is that they __________ very easily to new environments. [ ]
A. adapt
B. appeal
C. attach
D. apply
