咀嚼肌群痉挛的主要症状是（）
A.严重的开口受限
B.开口疼痛和咀嚼疼痛
C.弹响和杂音
D.开口歪斜
E.不伴头痛
参考答案：A
It is fairly common in Africa for _____ a group of musicians surrounded by others who also join in the performance.
A．there are
B．there being
C．there to be
D．there be
论述我国法律关于夫妻遗产继承权的主要内容？
