A:加强了中央集权
B:缓和了社会矛盾
C:打破了世袭特权
D:推进了民主政治进程
We used to see each other _____, but haven't heard from him since last year.
你的好朋友告诉你:“我的理想是当现代的农民”,你会怎样对他说( )
下列对核酸的叙述不正确的是