题目内容

Task 1 Word SelectionFill in the blanks with words given below. Change the form where necessary.1. Wetookupthistaskasachallengeandanalyzedhowto_____oursolution.2. Theseyoungstersaremotivatednotbyatoachieve,butbyfearoffailure.3. Moststates_therighttofreeandadequateeducation.4. Having_theproblem,thequestionarisesofhowtoovercomeit.5. Canyouguessthemeaningofthewordfromthe_?6. Therearesimilarheatedargumentsbetweentheruleoflawandruleofvirtueinthe_andtheOccident.7. Howbigisthegapbetweenwhatyouthinkyouareandwhatyou_are?8. To___herdegree,sheanswered81questionsover10papers.9. Massageisusedto_muscles, relievestressandimprovethecirculation.10. Smokersarewell_______ofthedangerstotheirownhealth.

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Task 3 Word FormationComplete each of the following sentences with the proper form of the word given in brackets.1. Cooking,_______undertakenbymothers,hasbeenoftentakenoverbyfathers nowadays. (tradition)2. Onlythe_ofthesegoalswillbringlastingpeace. (achieve)3. Increased_betweendifferentpoliceforceswouldimprovetherateofsolving crimes. (interact)4. Currentthinkingholdsthatobesityismoreamedicalthana_ problem. (psychology)5. Sheofferedhimandpracticalsupportincountlessways. (emotion)6. Thewriter's_seemstohavedriedup. (imagine)7. _problemstheyfoundinPolandwereamongtheworsttheyencountered. (environment)8. Charitiesappealedfor__offoodandclothingforvictimsofthehurricane. (donate)9. Themost_effectofthesechangesisinthewaypeoplearenowworkingtogether. (notice)10. Hissistersaidhehad_________giventhehospitalafalsenameandaddress. (deliberate)

设无向图的顶点个数为n，则该图最多有（）条边。

A. n2
B. n(n-1)/2
C. n(n+1)/2
D. 0

有n个顶点的有向图是强连通的，则该图至少需要（）条边。

A. n-l
B. n
C. n+l
D. 2n

n个结点的完全有向图含有边的数目是（）。

A. n*n
B. n(n+1)
C. n/2
D. n(n-l)