以下哪种关于国际标准化组织ISO9000质量认证体系的是正确的？（）Ⅰ、有关机构必须在国际标准化组织ISO登记；Ⅱ、国际标准化组织ISO颁发的证书永远有效；Ⅲ、国际标准化组织ISO颁发的证书在下次ISO审核前有效；Ⅳ、机构可自愿选择是否遵守国际标准化组织ISO的标准。

A.Ⅰ和Ⅱ是对的；

B.Ⅰ和Ⅲ是对的；

C.Ⅱ和Ⅳ是对的；

D.Ⅲ和Ⅳ是对的。

DOM is a platform-and language-____(66)___API that allows programs and scripts　to dynamically access and update the content, structure and style of WWW documents　(　currently,definitions for HTML and XML documents are part of the specification　).The　document can be further processed and the results of that processing can be　incoporporated back into the presented ___(67)____.DOM is a ___(68)___-based API to　documents ,which requires the whole document to be represented in ____(69)___while　processing it .A simpler alternative to DOM is the event –based SAX,which can be　used to process very large ___(70)___documents that do not fit info the memory　available for processing.

（70）处填（）。

A．XML

B．HTML

C．script

D．Web