Unit4Astronomythescienceofthestars课时作业新人教版必修3

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1、Unit4Astronomythescienceofthestars课时作业新人教版必修3I.阅读理解ATheHealthyllabitsSmzvey（调查）showsthatonlyaboutonethirdofAmericanseniorshavecorrecthabits.Herearesomefindingsandexpertadvice・1.Howmanytimesdidyoubrushyourteethyesterday?•Finding：Aful133%ofseniorsbrushtheirteethonlyonceaday

2、.•Step：Removethe300typesofbacteriainyourmoutheachmorningwithabattery-operatedtoothbrush.Brushgentlyfor2minutes,atleasttwiceaday2.Howmanytimesdidyouwashyourhandsorbatheyesterday?•Finding：Seniors,onaverage,bathefewerthan3daysaweek.Andnearly30%washtheirhandsonly4timesaday—ha

3、lfofthenumberdoctorsrecommend.•Step：Wetouchourfacesaround3,000timesaday一ofteninvitinggerms（病菌）toenterourmouth,nose,andeyes.Usetoiletpapertoavoidtouchingthedoorhandle.And,mostimportant,washyourhandsoftenwithhotrunningwaterandsoapfor20seconds.3.Howoftendoyouthinkaboutfighti

4、nggerms?•Finding：Seniorsarenotfightinggermsaswel1astheyshould.•Step：Beawareofgerms.Doyouknowitisnotyourtoiletbutyourkitchensponge（海绵）thatcancarrymoregermsthananythingelse?Tokillthesegerms,keepyourspongeinthemicrowavefor10seconds.［文章大意］本文为说明文。文章介绍的是一个对美国老年人健康习惯调查的结果以及专家给出的

5、对策。1.WhatisfoundoutaboutAmericanseniors?A.Mostofthemhavegoodhabits.B.Nearly30%ofthembathethreedaysaweek・C.Allofthemarefightinggermsbetterthanexpected.D.Aboutonethirdofthembrushtheirteethonlyonceaday.解析：细节理解题。根据第一个问题下Finding的内容"Afull33%ofseniorsbrushtheirteethonlyonceaday.

6、”可知D项正确。答案:D1.DoctorssuggestthatpeopleshouldwashtheirhandsA.twiceadayB.threetimesadayC.fourtimesadayD.eighttimesaday解析：细节理解题。根据第二个问题下Finding中的"Andnear!y30%washtheirhandsonly4timesaday——halfofthenumberdoctorsrecommend・”可矢口。答案：D2.Whichofthefollowingistrueaccordingtothetext?

7、A-WeshouldB.ThereareC.AkitchenD.Weshouldkeepfromtouchingourfaces.lessthan300typesofbacteriainthemouth.spongecancarrymoregermsthanatoi1et.washourhandsbeforetouchingadoorhandle.解析：细节理解题。根据第三个问题下Step内容中的“Doyouknowitisnotyourtoiletbutyourkitchensponge（海绵）thatcancarrymoregerms

8、thananythingelse?”可知。答案:C3.Thetextprobablycomesfrom•A.aguidebookB.apopularmagazineC.abookreviewD