作为黄素酶辅酶参与机体组织呼吸过程的维生素是（）
A.维生素PP
B.维生素B1
C.维生素B2
D.叶酸
E.维生素E
参考答案：C
― Is Kate in, please? I want to ______ her.
― Sorry, she is out. You'd better ______ her later. [ ]
A. see; find
B. speak to; call
C. visit; ring up
D. talk to; look for
