【同步练习】Unit 3 人教）

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1、人民教育出版社必修二畅言教育Unit3Computers同步练习◆听力练习蚌埠二中马爱军1-20（略）◆阅读理解阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题卡上将该项涂黑。ATheHealthyHabitsSurvey(调查)showsthatonlyaboutonethirdofAmericanseniorshavecorrecthabits.Herearesomefindingsandexpertadvice.1．Howmanytimesdidyoubrushyourteethyesterday?

2、lFinding：Afull33%ofseniorsbrushtheirteethonlyonceaday.lStep：Removethe300typesofbacteriainyourmoutheachmorningwithabattery用心用情服务教育人民教育出版社必修二畅言教育operatedtoothbrush.Brushgentlyfor2minutes,atleasttwiceaday.2．Howmanytimesdidyouwashyourhandsorbatheyesterday?lFinding：Seniors,on

3、average,bathefewerthan3daysaweek.Andnearly30%washtheirhandsonly4timesaday—halfofthenumberdoctorsrecommend.lStep：Wetouchourfacesaround3,000timesaday－ofteninvitinggerms(病菌)toenterourmouth,nose,andeyes.Usetoiletpapertoavoidtouchingthedoorhandle.And,mostimportant,washyourhan

4、dsoftenwithhotrunningwaterandsoapfor20seconds.3．Howoftendoyouthinkaboutfightinggerms?lFinding：Seniorsarenotfightinggermsaswellastheyshould.lStep：Beawareofgerms.Doyouknowitisnotyourtoiletbutyourkitchensponge(海绵)thatcancarrymoregermsthananythingelse?Tokillthesegerms,keepyo

5、urspongeinthemicrowavefor10seconds.21．WhatisfoundoutaboutAmericanseniors?A．Mostofthemhavegoodhabits.B．Nearly30%ofthembathethreedaysaweek.C．Allofthemarefightinggermsbetterthanexpected.D．Aboutonethirdofthembrushtheirteethonlyonceaday.22．Doctorssuggestthatpeopleshouldwashth

6、eirhands________.A．twiceadayB．threetimesadayC．fourtimesadayD．eighttimesaday23.Whichofthefollowingistrueaccordingtothetext?A．Weshouldkeepfromtouchingourfaces.B．Therearelessthan300typesofbacteriainthemouth.C．Akitchenspongecancarrymoregermsthanatoilet.D．Weshouldwashourhands

7、beforetouchingadoorhandle.24．Thetextprobablycomesfrom________.A．aguidebookB．apopularmagazineC．abookreviewD．anofficialdocumentBAcomputervirusisacomputerprogramthatiswrittenbyamalicious(怀有恶意的)author.Theyspreadbycopyingthemselves,thentransferringontoothercomputers.Therearea

8、round53,000computervirusesinexistence,withanewonedetectedevery18seconds.Acomputerviruscandoeverything,f