有关嫁接的叙述,错误的是( )
A:方法有枝接和芽接
B:接穗和砧木的形成层应紧密结合
C:属于有性生殖
D:能保持植株的优良性状
+ + + =26
+ + + + =31
=____
I think Chinese ____(字) are more difficult to learn than English.