—You really suffered a lot.
A:What a time
B:What time
C:How a time
D:How time
①食盐水 ②硫酸钠溶液 ③氯化钡溶液 ④碳酸钠溶液 ⑤硝酸银溶液.
Is it a panda?- Yes, it ____ (is, isn't).
下列事件是随机事件的是( ).