Originally introduced by Netscape Communications,___(66)___ are a general mechanism which HTTP Server side applications, such as CGI (67) , can use to both store and retrieve information on the HTTP ___(68)___ side of the connection. Basically, Cookies can be used to compensate for the ___(69)___ nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based ___(70)___ .

A．programs　

B．applications

C．frameworks　

D．constrains

刘先生家中的热水器因天气寒冷造成水箱冻裂，向厂家特约维修部报修后，维修人员将其水箱拆除，说要返厂维修，一直修了两个多月也没有修好。根据《部分商品修理、更换、退货（三包）责任规定》，因修理者自身原因使修理期超过30日的，消费者可要求修理者（）

A.免费修

B.退货，按发票价格一次退清货款

C.免费调换同型号同规格产品