选择恰当的选项补全话，其中两项是多余的。

A : Hi, Bob. What does your mother do?

B :      1      

A : Where does she work?

B :     2      

A : Do you want to be a doctor, too?

B :Oh, no, no.     3      

A : Why?  I think it's a hard job.

B:     4       , but      5      

A : Maybe.

A. She works in a hospital.

B. She is a nurse.

C. I want to be an actor.

D. it's exciting

E. It's dangerous.

F. She. is a doctor.

G. It's difficult

关于胸腺发育不全(DiGeorge综合征)的临床特点，应除外

A．常有多处畸形

B．胸腺发育不良

C．血清Ig常明显降低

D．对PHA增殖反应降低

E．新生儿期发生不易纠正的低钙抽搐