—When did you _____ London? 　　

—We _____ there in the afternoon. 　　[ ]

A. arrive at; arrived 　　　　　　　

B. arrive in; arrived 　

C. get to; got to 　　　　　　　　　

D. reach; got to

如图，可以表示人体口腔上皮细胞的是（　　）

A．

B．

C．

D．