据研究生物进化的过程中，______是非常重要的证据，科学家通过对始祖鸟的研究，

肺部肿块出现"爆玉米花"样的钙化特征多见于（）。

A.肺炎

B.肺脓肿

C.肺结核

D.肺癌

E.肺错构瘤

CRJ飞机飞行中，乘务人员应将座位拉出对驾驶舱阻隔。（）

Man: Thank you for your helpful assistance. Otherwise, I’d surely have missed it. The place is so out of the way.
Woman: It was a pleasure meeting you. Good-bye.
Question: Why does the man thank the woman().

A. She promised to help the man.

B. She came a long way to meet the man.

C. She took the man to where he wanted to go.

D. She suggested a way out of the difficulty for the man.

保险经纪人是基于保险人的利益，为投保人与保险人订立保险合同提供中介服务，并依法收取佣金的单位。 ( )

磁共振成像中两个90°脉冲之间的时间称为（）

A.重复时间

B.回波时间

C.回波重复时间

D.反转时间

E.反转恢复时间