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【单选题】
传统的集合“并、交、差”运算施加于两个关系时，这两个关系应该满足的条件有（）。A.
相对应的属性值不必须取自同一个域
B.
属性个数不相等
C.
对关系的属性及属性值没有要求
D.
属性个数相等
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反馈参考答案：
举一反三
【简答题】Skim the Text and Fill in the blanks.
【多选题】What steps can we follow when we skim a text?
A.
Read the title of the text.
B.
Read the first sentence of each paragraph.
C.
Read the first and the last paragraphs of the text.
D.
Read the subtitles or subheadings of the text.
【简答题】Skim the text and fill in the blanks
【单选题】Don ’ t take his remarks too seriously. He was so upset that I don ’ t think he really ________ what he was saying.
A.
knew
B.
was knowing
C.
knows
D.
had known
【单选题】The teacher gives students three minutes to skim a text， and when time is up， he asks them to stoo and answer questions. What role does the teacher play in this activity?
A.
Assessor.
B.
Controller.
C.
Participant.
D.
Prompter.
【单选题】The teacher gives students 2 minutes to skim a text， and when time is up， he asks studentsto stop and answer some questions. Here the teacher is playing the role of a（an） __________ .
A.
assessor
B.
prompter
C.
participant
D.
controller
【简答题】Skim the text and Fill in the blanks.
【简答题】Skim the text and fill in the blanks.
【多选题】What should you skim in the text?
A.
Headings 标题
B.
Keyword 关键词
C.
First and last sentence
D.
Bold words 粗体字
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