确定胆总管囊肿的最基本症状（）.
A.尿便改变
B.腹痛
C.发热、呕吐
D.腹腔肿物
E.黄疸
参考答案：B, D, E
In 1941 the US ________ war on the Axis.
A．informed
B．declared
C．announced
D．related
The roof fell before he had time to ________ the room to save his baby.[ ]
A．dash off
B．dash into
C．dash out
D．dash up
