题目内容

7

A. Theydobetterthanyearsago.
B. Theybecomefamousafterthegames.
C. TheystillhavetheOlympicspirit.
D. Theyspreadhappiness.

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8

A. Thesportsplayedinsummer.
B. Thesportsplayedindoors.
C. Theinfluenceofgreatathletes.
D. Theinfluenceofgovernmentsandsponsorship.

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9

A. Movesomesummersportstothewintersports.
B. IntroducesomenewsportstotheOlympics.
C. Reducesomeindoorsummersports.
D. GetallcountriesinvolvedintheOlympics.

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10

A. Hewillpaycloseattentiontohisowncountry.
B. HewillspendoverfourhoursaweekwatchingTV.
C. Hewillfocusonskiingandhockey.
D. Hewillmakeagoodscheduleofwhattowatch.

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设A={a,b,c}，A上二元关系R={〈a,a〉，〈b,b〉,〈a,c〉}，则关系R的对称闭包S(R)是( )

A. R∪IA
B. R
C. R∪{〈c,a〉}
D. R∩IA

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7

A. Theydobetterthanyearsago. B. Theybecomefamousafterthegames. C. TheystillhavetheOlympicspirit. D. Theyspreadhappiness.

8

9

10

设A={a,b,c}，A上二元关系R={〈a,a〉，〈b,b〉,〈a,c〉}，则关系R的对称闭包S(R)是( )

A. Theydobetterthanyearsago.
B. Theybecomefamousafterthegames.
C. TheystillhavetheOlympicspirit.
D. Theyspreadhappiness.