下述慢性腹泻的病因中属于感染性因素的是（）
A.缺血性肠炎
B.溃疡性结肠炎
C.憩室炎
D.肠结核
E.克罗恩（Crohn）病
参考答案：D
________，he talks a lot about his favorite singers after class.
A．A quiet student as he may be
B．Quiet student as he may be
C．Be a quiet student as he may
D．Quiet as he may be a student
（）是理所当然的家庭教育的鼻祖。
