A:doesn’t
B:don’t
C:isn’t
D:aren’t
You must wear strong shoes and socks ____ you climb the mountains.
参赛者
甲
乙
丙
成绩/s
13.6
13.8
13.7
秦始皇“焚书坑儒”和汉武帝“罢黜百家,独尊儒术”的共同点是( )