Read the dialogue and choose. (选择适当的句子填空)

① I have a toothache.   

②You look sad.

③ See the doctor and take some medicine.

A: How are you？__________

B: Yes, I failed the English test.

A: I'm sorry to hear that.

B: How about you？

A: I feel sad, too. _________

B: _________

A: Thank you. I will.

在骨软骨瘤的声像图上，软骨帽的周围可出现无回声区，使软骨帽本身回声反射更加明显。该无回声区的组织结构是（）

A.软骨膜

B.骨性肿块

C.滑液囊

D.移位的血管

E.假性动脉瘤