高中英语人教版必修2同步练习Unit 3.docx

高中英语人教版必修2同步练习Unit 3.docx

《高中英语人教版必修2同步练习Unit 3.docx》由会员分享，可在线阅读，更多相关《高中英语人教版必修2同步练习Unit 3.docx（13页珍藏版）》请在冰豆网上搜索。

高中英语人教版必修2同步练习Unit3

Unit3Computers

同步练习

1-20（略）

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。

A

TheHealthyHabitsSurvey（调查）showsthatonlyaboutonethirdofAmericanseniorshavecorrecthabits.Herearesomefindingsandexpertadvice.

1．Howmanytimesdidyoubrushyourteethyesterday?

●Finding：

Afull33%ofseniorsbrushtheirteethonlyonceaday.

●Step：

Removethe300typesofbacteriainyourmoutheachmorningwithabatteryoperatedtoothbrush.Brushgentlyfor2minutes,atleasttwiceaday.

2．Howmanytimesdidyouwashyourhandsorbatheyesterday?

●Finding：

Seniors,onaverage,bathefewerthan3daysaweek.Andnearly30%washtheirhandsonly4timesaday—halfofthenumberdoctorsrecommend.

●Step：

Wetouchourfacesaround3,000timesaday－ofteninvitinggerms（病菌）toenterourmouth,nose,andeyes.Usetoiletpapertoavoidtouchingthedoorhandle.And,mostimportant,washyourhandsoftenwithhotrunningwaterandsoapfor20seconds.

3．Howoftendoyouthinkaboutfightinggerms?

●Finding：

Seniorsarenotfightinggermsaswellastheyshould.

●Step：

Beawareofgerms.Doyouknowitisnotyourtoiletbutyourkitchensponge（海绵）thatcancarrymoregermsthananythingelse?

Tokillthesegerms,keepyourspongeinthemicrowavefor10seconds.

21．WhatisfoundoutaboutAmericanseniors?

A．Mostofthemhavegoodhabits.

B．Nearly30%ofthembathethreedaysaweek.

C．Allofthemarefightinggermsbetterthanexpected.

D．Aboutonethirdofthembrushtheirteethonlyonceaday.

22．Doctorssuggestthatpeopleshouldwashtheirhands________.

A．twiceadayB．threetimesaday

C．fourtimesadayD．eighttimesaday

23.Whichofthefollowingistrueaccordingtothetext?

A．Weshouldkeepfromtouchingourfaces.

B．Therearelessthan300typesofbacteriainthemouth.

C．Akitchenspongecancarrymoregermsthanatoilet.

D．Weshouldwashourhandsbeforetouchingadoorhandle.

24．Thetextprobablycomesfrom________.

A．aguidebookB．apopularmagazine

C

．abookreviewD．anofficialdocument

B

Acomputervirusisacomputerprogramthatiswrittenbyamalicious（怀有恶意的）author.Theyspreadbycopyingthemselves,thentransferringontoothercomputers.Therearearound53,000computervirusesinexistence,withanewonedetectedevery18seconds.Acomputerviruscandoeverything,frompoppingupashortmessagetowipingkeyfiles,sothatyourcomputerdoesn’twork.The“ILOVEYOU”virusinfectedupto45millioncomputers,causing￡7billionworthofdamageworldwide.

Howtoavoidcatchingavirus?

Staycalm.Acomputervirusisn’tdangerousuntiltheinfectede-mailisopened.Deleteditemsfolder.Don’topenanyattachment（附件）youarenotsureabout,evenifyouhaveavirusscanner.Readthee-mailandcheckthatthecontentsofthemessagemakesensebeforeyouopenanyattachment.Don’tforwardanyattachmenttoafriendwithoutbeingsureitissafe.

Lookoutforhoaxes.Therearemanye-mailswarningof“themostdestructivevirusever”,butoftenthesevirusesdon’texist.Don’tsendane-mailabouta“newvirus”withoutcheckingitout.Visitsitesliketocheckforhoaxes.

Sendanye-mailthatyouthinkisinfectedtoananti-viruscompany.Theycantellyouwhetheritisavirustoanyoneexcepttheofficialviruscompanies.Mailfilteringsystemwillprobablydeleteitanyway.

Ifyougetacomputervirusyou’llneedtouseavirusscannertogetridofit.Don’tbecarelessjustbecauseyouhaveavirusscanner.Youwillstillneedtokeepyoureyesopenincaseanewvirusappears.

25.Thecomputerviruscandoeverythingexcept____.

A.popupashortmessageB.attackthecomputerusersdirectly

C.wipekeyfilesDcopyoutitself.

26.Thebestwaytocheckwhetheritisavirusornotisto______.

A.checkitbyyourselfB.askyourfriendforhelp

C.usethevirusscannerD.sendthee-mailtoananti-viruscompany

27.Thispassagemainlytellsus___.

A.whatisacomputervirus

B.whatisthedamageofacomputervirus

C.howtoavoidgettingacomputervirus

D.howtodeleteacomputervirus

C

Mostchildrennowchatdailyeitheronlineorthroughtheirmobilephones.Theyareconnectingtoahugenumberofotherchildrenallovertheworld.Someareshy"inreallife"butareconfidenttocommunicatewithothersonline.Othersfindsupportfrompeopleoftheirownageonrelationshipissues,orproblemsathome.

Sometimestheonlineworld,justliketherealworld,canintroduceproblems,suchasbullyingorarguments.Goingonlineisgreatfun,buttherearealsoafewpeoplewhousetheInternetforoffensive（冒犯性的）orillegalaims.Childrenmustbemadeawareofboththegoodthingsandthedangers.

Tokeepchildrensafe,yourmanagementmustcoverthefamilycomputer.JustasyoudecidewhichTVprogrammesaresuitable,youneedtodothesam