下列化合物碱性最弱的是：
A．NH3
B．CH3NH2
C．
D．
E．CH3NHCH3
参考答案：C
---What kind of movies do you like?
---I like ____________ because I can learn a lot about history.
A action movies B documentaries C thrillers D comedies
“白云千载空悠悠”说的是江南哪座名楼？
