题目内容

用有向图结构表示实体类型及实体间联系的数据模型称为__________模型,数据之间的联系通常通过__________实现

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_______是目前最常用也是最重要的一种数据模型。采用该模型作为数据的组织方式的数据库系统称为_______。

Men differ from animals they can think and speak. (2008)

A. for which
B. for that
C. in that
D. in which

Above the trees are the hills, magnificence the river faithfully reflects on the surface. (2003)

A. where
B. of whose
C. whose
D. which

–Does Alan like hamburgers? (2003)-Yes. So much that he eats them almost every day.

A. for
B. as
C. to
D. so

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