Due to a constantly (66) environment, a poor understanding of the user’s needs and preferences, as well as a (67) of willingness to modify. (68) organizational structures and decision models, the full economic potential of Web Information Systems (WIS) has not been realized by now. The data object types of the (69) meta model, the Extended World Wide Web Design Technique (eW3DT), provide hypertext designers (70) a conceptual, user-centric framework and graphical notation for the construction of both, (71) and customized models, during the software development (72) of commercial WIS. A reference model as a normative concept represents an abstraction of a (73) company, its functional units, or its Web Information System and is intended to streamline the design and implementation of complex applications at (74) costs. As precondition for pursuing a partial globalization strategy,eW3DT (75) between technical and content-specific responsibilities for designing, implementing, and maintaining WIS.

（70）（）

A.of

B.in

C.to

D.with

有关锌缺乏，下列哪项描述是错误的（）

A.动物性食物和坚果类含锌较高，但素食者容易缺锌

B.缺锌主要表现为食欲缺乏、生长发育减慢、免疫功能低下、味觉减退和夜盲

C.发锌能够准确反映近期体内的锌营养状况

D.空腹血清锌浓度测定和餐后血清锌浓度反应试验有助于锌缺乏的诊断

E.提倡母乳喂养、坚持平衡膳食是预防缺锌的主要措施