钩体病感染后可获得的免疫力为（）

A.同型终生免疫力

B.无免疫力

C.持久的交叉免疫力

D.同型持久免疫力

E.同型短暂免疫力

The usual address for a Web site is the ______ page address，although you can enter the address of any page and have that page sent to you.

A．home

B．main

C．host

D．house