Last year the number of students who graduated with a driving license reached 200,000, a (n)

________ of 40,000 per year. [ ]

A. average  

B. number

C. amount  

D. quantity

人类的交际符号系统，可划分为两大类型，即言语交际符号和（）

A、文字符号

B、表情符号

C、肢体动作符号

D、非言语交际符号