A:shouldn't have enjoyed
B:needn't have enjoyed
C:wouldn't have enjoyed
D:couldn't have enjoyed
①只有加强思想道德修养,才能真正提升诗的品格
②有了好的人品,就能创作出有诗品的优秀作品
③文如其人表明诗品是人品的派生物和附属品
④诗品与人品的背离佐证了文化的相对独立性
下列括号内各应填什么数?
(+2)-(-3)=(+2)+____;
0-(-4)=0+____;
(-6)-3=(-6)+____;
1-(+39)=1+____.
秦长城的东西起止点是( )