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【单选题】
设R是非空集合A上的关系,则( )。A.
R是自反的当且仅当r(R)=R 0
B.
R是对称的当且仅当t(R)=R
C.
R是传递的当且仅当t(R)=I A
D.
R是对称的当且仅当s(R)=R
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反馈参考答案：
举一反三
【单选题】Everybody except Mike and Linda ______there when the meeting began
A.
is
B.
are
C.
was
D.
were
【单选题】Take one minute to skim the reading. Then answer the questions.(略读Reading,选出这篇文章的最佳标题) Which is the best title for this article?
A.
Lottery Not Popular with Americans
B.
Lucky Couple Wins the Lottery Twice
C.
This Week's Lottery: $1 million!
【简答题】Skim the title, the first and last
sentence of each paragraph of Text B and fill in the blanks.
【单选题】Look at the title of this reading: "Coping with stress." Skim through the reading. What is the central question that this text is trying to answer?
A.
Why do people feel stress?
B.
What happens to people who feel stress?
C.
What are some ways to reduce stress?
【简答题】Exercise 3 Skim the following passage and then choose from the list below one heading for the title of the passage and one heading for each section. A. College Debtors B. Visiting Students C. Terms & ...
【单选题】Look at the title of this reading: “Coping with Stress.” Skim through the reading. What is the central question that this text is trying to answer?
A.
Why do people feel stress?
B.
What happens to people who feel stress?
C.
What are some ways to reduce stress?
【单选题】Take one minute to skim the reading, and then answer the question. Which is the best title for the police report? Choose your answer.(略读Reading文章,回答问题:这篇警事报道的最佳标题是哪一个?选择正确的答案。)
A.
A Neighborhood Fight
B.
An Apartment Fire
C.
A House Robbery
【简答题】Skim the title, the subtitles and the first sentence of each paragraph of the text and fill in the blanks. ____________________ is crucial to a successful business.
【单选题】Everybody except Mike and Linda __ there when the meeting began.
A.
are
B.
was
C.
were
D.
is
相关题目：
【简答题】Skim the title, the first and last
sentence of each paragraph of Text B and fill in the blanks.
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