大肠黏膜部位肠液的pH值为（）
A.8.0～8.1
B.8.1～8.2
C.8.2～8.3
D.8.3～8.4
E.8.4～8.5
参考答案：D
It is _____ my father worked _____ I work now.
A．where, that
B．where, when
C．that, where
D．that, that
什么是基于Internet的资源型学习？
