问题
选择题
Last year the number of students who graduated with a driving license reached 200,000，a(n) ________ of 40,000 per year.(2010·江西)
A．average
B．number
C．amount
D．quantity
答案
答案：A
句意：去年考过驾照的学生人数达到了20万，平均每年4万。an average of意为“平均数”。