Larry asks Bill and Peter to go on a picnic with him, but          of them wants to,because they have

work to do. [ ]

A. either          

B. any            

C. neither        

D none

强制性标准以外的标准是推荐性标准，也就是说，推荐性标准是非强制执行的标准，国家鼓励企业自愿采用推荐性标准。