下列哪种因素不是引起新生儿坏死性小肠炎的因素（）。

A.肠管先天性缺乏性损害

B.缺乏免疫抗体

C.过量液体输入

D.脐静脉压力的改变影响肠系膜血流

E.小肠发育不良

---- Do you think it’s a good idea to make friends with your students?

----        , I do. I think it’s a great idea.  

A．Really

B．Obviously

C．Actually

D．Generally