引用应以论证自己观点的必要性为限,要避免()。
A.无法判断
B.重复引用
C.过度引用
参考答案:C
在克山病区人群膳食中,下列哪种元素可促进硒的排泄()。
A.氟
B.钼
C.钙
D.碘
E.锰
-Where is that report?
-I brought it to you you were in Mr Black's office yesterday. [ ]
A. if
B. when
C. because
D. before