I have learned how to keep my hair ________.
So _____ my classmates.
A:health, have
B:healthy, have
C:healthy, do
D:health, do
如图,∠A是⊙O的圆周角,若∠A=40°,则∠OBC=____ 度。
与其他三个民族不属于同一人种的是( )