为鉴定一包混合固体粉末(可能含有适量的CaCO3、CuO、Fe2O3、C中的一种或几种)的组成,设计以下流程,并记录实验现象,得出的正确结论是( )
①可能含有CaCO3
②肯定含有Fe2O3
③可能含有CuO
④肯定含有C.
A:①②
B:①②③
C:①②④
D:①③④
请回答下列问题:
What happened?
____ hit an old man.
Where did the accident happen?
On ____
Who sent the man to the hospital?
____
Is the traffic busy now?
What's the suggestion of the reporter?
To go____.