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问题 填空题

关系的数据操纵语言按照表达式查询方式可分为两大类，关系代数和_______。

答案

参考答案：关系演算

选择题

下列词语中，加点的字每对读音都不相同的一项是（  ）

A．睥睨/稗官野史盘桓/恒河沙数秩序井然/卷帙浩繁

B．通缉/开门揖盗标识/博闻强识涸辙之鲋/清澈见底

C．下榻/死心塌地夏桀/命途多舛数不胜数/数见不鲜

D．金钏/串通一气惆怅/风流倜傥比比皆是/蚍蜉撼大树
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补全对话，情景问答
情景交际。从方框中选择恰当的句子，补全对话。(其中有两项是多余的)
A. What kind of animals do you like best,
B. That must be fun.  
C. What are you thinking about?
D. I agree with you.  
E. As we know, animals are our friends.  
F. Because they are more lovely and they can give us joy.  
G. I like both animals and plants.
A: Hi, Mike! __1__
B: I'm thinking about animals.  
A: Animals?__2__ dogs, pandas, or birds?
B: I like panda best.
A: Why?
B: __3__ 
A: __4__ .  Why not go to the zoo to see the pandas this weekend?
B: It sounds like a good idea. __5__ I'd like you to go with me.
A: OK! That's a deal!
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