（全国卷）2019届高考英语一轮复习 Unit 4 Earthquakes课时作业 新人教版必修1

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1、Unit4EarthquakesⅠ.阅读理解APeoplelovecellphones，whichiswhynineintenAmericansownone.Butdoesheavyuseofcellphonesposeariskofcancer?Thisquestionhascausedcontroversyformanyyears.Anewstudyinratsnowaugmentsthoseconcerns.Itsdatalinkedlongterm，intenseexposuretorad

2、iationfromcellphoneswithanincreasedriskofcancerintheheartorbrain.Theresultshaveyettobeconfirmed，theauthorsnote.Indeed，althoughtheratstudyfoundalinkbetweencellphoneradiationandcancer，itoffersnocluestowhysuchalinkmightexist，notesJonathanSamet.Heteachesp

3、reventativemedicineanddirectstheInstituteforGlobalHealthattheUniversityofSouthernCaliforniainLosAngeles.Still，hecallsthenewstudy'sfindings“significant”．Theycouldleadtostudiesresearchinghowcellphoneradiationmightcausecancer，hesays.Phonesignalsarerelaye

4、dbetweencelltowersandcellphonesviaradiowaves.Thisradiofrequency—orRF—radiationisatypeknownasnonionizing(非电离的)．UnlikeXrays，nonionizingradiationdoesnotdepositenoughenergyintocellstoreleaseelectronsfromatomsormolecules，producingions.Soittendstobefarlessh

5、armfulthanionizingradiation，suchasXrays.Butthatdoesnotmeanradiowavesmightnotcauseharm.Inverylargedoses(量)thisradiationwillheatthebodyandcausetissuedamage.Butit'snotyetknownwhatmuchlowerRFlevelsmightdo，suchasthosefromcellphoneuse.Fiveyearsago，theWorldH

6、ealthOrganization'sInternationalAgencyforResearchonCancer，orIARC，concludedthatcellphoneuse“ispossiblycarcinogenic(致癌的)”．Itsconclusionwasbasedonwhatlittleresearchdatawasavailableatthattime.ButnoticethatIARCwasnotcertain.Itsaidonlythatphoneusemight“poss

7、ibly”causecancer.SoscientistsattheNationalToxicologyProgram，orNTP，investigatedfurther.[语篇解读]　本文是一篇说明文。人们喜欢用手机，90%的美国人都有手机。那么，过度使用手机是否会有患癌的风险呢？一项新的研究给出了一些线索。1．Whichofthefollowingcanreplacetheunderlinedword“augments”？A．figuresout　　　　B．putsoutC．referstoD

8、．addsto解析：词义猜测题。画线词前面提到过度使用手机是否有患癌的风险这一问题多年来引发的争议不断，再根据画线词后的“concerns”和“Itsdatalinkedlongterm，intenseexposuretoradiationfromcellphoneswithanincreasedriskofcancerintheheartorbrain.”可知，现在一项在老鼠身上进行的新研究增加了那些忧虑。故画线词与addsto意义相近。答案：D2．Inwhichaspectdo