Living with a host family while studying abroad, in which there may be some other college students, __________ you the chance to learn more about the new culture.

A．give

B．gives

C．giving

D．to give

[复合型非选择题]中年男性患者，发热、黄疸。血清学检查HBsAg（+）、抗-HtBs（+）。

HBV感染，下列哪种成分用常规方法在血清中查不到（）

A.HBsAg

B.抗-HBs

C.抗-HBe

D.HBeAg

E.HBcAg