How many hours __________in a day? [ ]
A. has
B. have
C. are there
D. there are
C
.
Atlanta is representative of the new South, a place _______ hope and faith have replaced fear and doubt.
A.which
B.where
C.what
D.that
属于抑制菌斑牙膏中成分的是()
A.硝酸钾
B.焦磷酸盐
C.西比氯胺
D.五倍子
E.氟化亚锡