用Kruskal算法求一个连通的带权图的最小代价生成树,在算法执行的某时刻,已选取的边集合TE={(1,2),(2,3),(3,5)},要选取下一条权值最小的边,可能选取的边__________。
A. (1,2)
B. (3,5)
C. (2,5)
D. (6,7)
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若含有n个顶点的无向图恰好形成一个环,则它有__________棵生成树。
连通图的生成树包含了图中的所有顶点。
A. 对
B. 错
Task 1 Word SelectionFill in the blanks with words given below. Change the form where necessary.1. Sheisreluctanttodiscussthe_____________oftheplay.2. _____________numerousfailures,theycontinuedtoconducttheexperiment.3. Themain_____________ofthemerchantbanksistoraisecapitalforindustry.4. Ihopeinyearstocomehewill_____________onhisdecision5. The temperature of this city _____________ from 0℃ to 30℃..6. You will be informed of the details at the _____________ time.7. Thenovelpresentsone_____________ofthereforminthecountryside.8. Whenweinvestinlearningand_____________,weinvestinhumandignity,developmentandpeace.9. We will resolutely ____________ our internationalist duty no matter whathappens.10. Thechildisvery_____________andevenhisfathercannotmanagehim.
Task 3 Word FormationComplete each of the following sentences with the proper form of the word given in brackets.1. The_____________forthecourseinvolveswrittenassignmentsandpracticaltests.(assess)2. Contrarytogeneral_____________,heannouncedthatallfourhadgiventheirapproval. (expect)3. Responsibility,dialogue,actionandreportingarethekeyelementsina_________circlethroughwhicheveryonebenefits. (virtue)4. Ideasaboutthesocialsignificanceof____________havechangedovertime.(religious)5. Thenew-mediaindustryattractsyoungand_____________people. (create)6. Theybumpedhimoffbecauseheknewtoomuchabouttheir_____________activities. (legal)7. TheFestivalOfAsianArts&Musicwillincludetwodaysoflive_____________.(perform)8. Oneofthedrivingforcesbehindthisrecent___________isthegrowthofservices.(expand)9. Akeyissueforhighereducationinthe1990'sistheneedforgreater__________ofcourses (diverse)10. His_____________wasbecomingincreasinglyirrational.(behave)