-- Are all the titles of the articles ______ in the contents?
--Yes, all ______.
A:listed; included
B:listing; includes
C:listed; including
D:being listed; being included
下列叙述正确的是( )
若关于x的一元二次方程kx2﹣4x+3=0有实数根,则k的非负整数值是( )