世界上使用人数最多和分布最广的语言分别是( )
A:英语、汉语
B:汉语、法语
C:汉语、英语
D:法语、日语
— Mum, can you give me some advice on how to behave myself at the table?
— Well, I do have some advice. , please keep quiet while eating.
若式子(a-1)x+3 的值与x的取值无关,则a=____.