----  Thanks a lot for your book. I found it very interesting.

----  _______. I’m glad you enjoyed it.

A．All the best

B．It is nothing

C．No thanks

D．Very well.

伤寒病理改变最显著的部位是（）

A.肝

B.脾

C.回肠和空肠

D.骨髓

E.回肠下段集合淋巴结和孤立淋巴结