WARNING:Holdingacellphoneagainstyourearorputtingitinyourpocketmaybebadforyourhealth.Thissentenceisawarningthatyou’dbetternotputitclosetoyouwhenanewphoneisbought.Applecompanyforexample

　　WARNING:Holdingacellphoneagainstyourearorputtingitinyourpocketmaybebadforyourhealth.   

　　Thissentenceisawarningthatyou’dbetternotputitclosetoyouwhenanewphoneisbought.Applecompanyforexampledoesn'twantIPhonestocomeclosertoyouthan1.5centimeters;ResearchInMotionBlackBerry'sproducerrecommends2.5centimeters.

　　(1)Ifcellphoneusecan       healthproblemsthe        willbeveryserious.Americansspend2.26trillionminuteschattingoncellphoneseveryyearwhichbrings$109billionforthewirelessbusinessmen.

　　DevraDavisanepidemiologist(皮肤病专家)whohasworkedfortheUniversityofPittsburghhaspublishedabookaboutmobilephoneradiation（辐射）"Disconnect."Davisstudieshowoftenbraincancerhappensduringdifferentagegroups.Shefindsabigincreaseinbraincancerinthe20-to-29agegroupandadropfortheolderpeople.

　　Childrenaremoreeasilyhurtbyradiationthangrown-upsMs.Davisandotherscientistspointout.Butnostudieshaveyetbeenfinishedoncellphoneradiationandchildrenshesays.

　　HenryLaiaresearchprofessorbeganlabradiationstudiesin1980andfoundthatmiceexposedto(暴露在)radiofrequency（电波频率）radiationhaddestroyedDNAintheirbrains.

　　Ms.Davisrecommendsusingwiredearphones（有线耳机）orthephone'sspeaker.(2)Childrenshouldsendtextmessagesratherthancallshesaidandpregnant（怀孕的）womenshouldkeepphonesawayfromtheirbodies.

　　1.在（1）句空白处填入适当的词使句意完整、上下文通顺。

　　2.将（2）句翻译成中文。

　　3.回答问题：Whatkindofpeoplewithbraincanceraregettingmoreandmore?

　　4.照出同意句。

　　Scientistsarestillcarryingonwiththestudiesoncellphoneradiationandchildren.

　　5.找出或写出该短文的主题句。