纯净时无色并呈酸性的消化液是（）
A.唾液
B.胆汁
C.胃液
D.胰液
E.小肠液
参考答案：C
has been announced, we shall have our sports meet next week.
A．That
B．It
C．As
D．What
怎样做好小蚕期的防病工作？
