前腭突与上颌突未联合或联合不全形成（）

A.单侧唇裂

B.斜面裂

C.横面裂

D.腭裂

E.颌裂

补全对话。

Tom: Hi, Fred. Where are you going?

Fred: To the playground.

Tom: What 1_____ you 2 _____ play?

Fred: We 3_____ play football. 4 _____ you 5_____ play with us?

Tom: No. 6 _____  study. There is an examination tomorrow.

Fred: Oh, that's too bad. Our examination is next week. I 7_____ study tomorrow.

Tom: OK. See you, Fred.

Fred: See you.