A:①②③
B:①②④
C:②③④
D:①②③④
可以证明次氯酸是弱酸的事实是( )
选词填空。
A.sunny B. morning C. OK D. weather E. zoo
A: Good ____.
B: Good morning.
A: How is the ____?
B: It's ____.
A: Let's go to the ____.
B:____.