某校历史学习小组开展“感知170万年前生活,寻找远古人类遗迹”的活动,他们应该去( )
A:北京周口店
B:云南元谋县
C:浙江余姚
D:陕西西安
In some ways, Lily and Lucy look ________, but the twins are a little different ________ each other.