Mr Wang and his students ____________ a lesson now.[ ]
A. are having
B. had
C. have
答案:A
下面两种图形各代表什么数?
15=△+△+△
○+○+○+○+○=10
△=( );○=( )
下列哪些食品色素可用于熟肉制品着色()
A.胭脂红
B.柠檬黄
C.苋菜红
D.红曲米