______ giving up, he went on with his research,got his PhD and married the girl.

A．Without

B．Except

C．Instead of

D．But for

某些酵母菌上下两细胞连接处呈细腰状，通常称为：（）

A.有隔菌丝；

B.无隔菌丝；

C.假菌丝；

D.异核菌丝