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

__________ of 40,000 per year. [ ]

A. average  

B. number

C. amount  

D. quantity

交感型颈椎病临床症状主要是（）

A.颈僵直，活动受限，头痛，肩、臂疼痛，手麻木

B.头眩晕，伴有恶心呕吐、耳鸣、耳聋

C.头晕、肿胀、视物模糊、心慌、出汗、失眠、血压不稳

D.下肢无力，小腿发胀、紧缩，上、下肢麻木，手足颤抖

E.颈偏向一侧