One choice for me is to study in a university in a large city rather than _______ in a small town. And another choice for me is _______ of studying abroad.

A．one; one

B．one; that

C．that; one

D．that; that

管型的基质主要是()

A.核蛋白 

B.球蛋白 

C.粘蛋白 

D.T-H蛋白 

E.α球蛋白