腹部叩诊有移动性浊音，表示哪种病征
A．急性胃扩张
B．巨大卵巢囊肿
C．尿潴留
D．腹腔内有游离腹水
E．幽门梗阻
参考答案：D
---How did you work out the difficult chemistry problem?
--- I worked it out by ________.
A．working with a group
B．think very hard
C．ask the teacher for help
D．doing oneself
下列几项中不属于音乐的基本要素的是（）。
A.歌词
B.速度
C.旋律
D.节奏
