题目内容

以下哪些属于视图的优点( )

A. 使用视图可以简化数据的操作
B. 使用视图可以提高安全性
C. 视图使用起来更加麻烦
D. 使用视图比直接写SQL语句复杂

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The text is a _________ about research on the effects of ____________________ on student_____________________.

According to the research, how does a heavy commitment to part-time work affect school performance? (Para. 2)________and significantly____________ with school achievement and commitment.

What's the main idea of part II?It reports the research ___________.

The author provides explanations for the findings:explanation 1:One common response to this time pressure is that working students _______ ______by taking easier classes, copying assignments from other students, _______ _______,or refusing to do work assigned by their teachers.explanation 2:Working students are too tired from work to study because they get less rest and eat less ____ _____.explanation 3:The excitement of earning large sums of spending money makes school seem less ____ and interesting.explanation 4:Working students take drugs and use alcohol more often than ________ students.

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