Thanks to the Internet, different kinds of information _______ in a short time.
A:can be learned
B:has been learned
C:can learn
D:has learned
下面句子不是比喻句的是( )
在月季、菊的栽培中,人们常用扦插的方法.这种不经过两性生殖细胞的结合,由母体直接产生新个体的生殖方式称为____.