《黄河大合唱》写成于抗日战争时期，是音乐家（）最重要和影响最大的一部代表作。
A.聂耳
B.冼星海
C.刘天华
D.贺绿汀
参考答案：B
Only when they were told the date of the wedding ________ their daughter would get married. [ ]
A. realized they
B. did they realized
C. did they realize
D. they did realize
下列肝血管瘤的声像图特征中，正确的是（）。
A.大血管瘤以高回声型多见
B.小血管瘤以低回声型多见
C.可表现为混合回声影
D.多数血管瘤结节内可见丰富的血流信号
E.边界多不清晰
