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【单选题】
为了加快数据库的访问速度，可以对数据库建立并使用( )，它在数据库的整个生命周期都存在。A.
数据表
B.
主键
C.
记录
D.
索引
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【简答题】根据中文提示完成下列句子。 1. I live in a __________ (旅馆) in Beijing. 2. There is a big __________ (卡车) on the road. 3. Let's have a walk on the __________ (大街). 4. Danny can't swim. He is __________ (害怕的). 5. Li ...
【简答题】根据中文提示完成下列句子。 1. Beijing is a __________ (著名的) city. 2. The shoes are too __________ (小) for me. 3. What __________ (颜色) is your pen? 4. I __________ (买) a flower yesterday. 5. The trip is very ______...
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