常见的公共福利一般有哪几种？（）
A.医疗保险
B.失业保险
C.养老保险
D.伤残保险
参考答案：A, B, C, D
With the help of high technology, more and more new substances ______ in the past 10 years.
A．discovered
B．have discovered
C．had been discovered
D．have been discovered
颈椎病的神经根性病变的治疗不包括（）
A.颈围
B.NSAIDs
C.热或冰敷
D.颈椎牵引
E.手术
