There ____ lots of bad information that is not suitable for teenagers on the Internet.
A:seem to be
B:seems to have
C:seem to have
D:seems to be
已知x,y,z为非零实数,代数式 x|x|+y|y|+z|z|+|xyz|xyz 的值所组成的集合是M,则下列判断正确的是( )
下列地区民居特点的叙述正确的是( )