动脖，弹指头，翻腕子，脚的步伐三步一抬，前后点步，垫步，单腿跪蹲等是（）的典型特性动作。
A.回族舞
B.藏族舞
C.维族舞
参考答案：C
Either you or one of your students _______to attend the meeting that will be held tomorrow.
A． are
B．is
C．have
D． be
现浇钢筋砼梁、板，当跨度大于（）时应起拱。
A、2m
B、3m
C、4m
D、5m
