（）的歌唱节日，壮族叫“歌墟”，苗族叫“游方”，侗族叫“坐妹”，蒙古族叫“敖包会”，回族叫“花儿会”，瑶族叫“放浪”。
参考答案：少数民族
影响水稻生长的非生物因素是 [ ]
A．水稻田间的杂草
B．管理水稻的农民
C．阳光
D．水稻的害虫
—Why didn't you answer the phone last night?
—I ___ when you called. [ ]
A. had to slept
B. must have been sleeping
C. have to be sleeping
D. must have slept
