下列结构在青春期以后退化萎缩的是()。
A.bronchi
B.esophagus
C.thoracicduct
D.thymus
E.trachea
参考答案:D
用所给词的适当形式填空。
1. The house __ (surround) by police last night.
2. Was the snake __ (live) or dead?
3. He never __(depend) on anyone in those days.
4. They had great difficulty in __ (breathe) ,for the air was thin.
5.A little girl in white __(draw) my attention that day.
6. You have had a life of joy,and ___ (please) and success.
7. The two girls look the same,l think they're __ ( twin).
办理出国签证时要上交(),并填写签证表。
A.护照
B.出国申请批件
C.有效证件
D.对方国家邀请函