The small town is so good a place _____ many people come to visit ____  it has become well known all over the world.

A．that ; as

B．as ; as

C．that ; that

D．as ; that

关于副皮质区的结构特征哪项是错误的？（）

A.是一片弥散的淋巴组织

B.位于淋巴小结和髓质之间

C.含有毛细血管后微静脉

D.有许多B.细胞及巨噬细胞

E.新生动物去胸腺后，此区显示空竭状