汉族的集中分布区主要在（）等区域。
A.青藏高原
B.黄河流域
C.长江流域
D.天山山脉
参考答案：B, C
Almost all students in my class _____ the school bus to the school. [ ]
A. get by
B. take
C. sit in
D. take on
速度杠杆
