[单选]  二、阅读理解阅读下面的文章，根据文章内容，完成相应的选择题。（每题10分）　　Aquestionthatoftentroublesfoodcompaniesishowtocontrolproblemslikeratsandinsectswithoutharmingthefood.Pestcontrolexpertssaypoisonsshouldneverbeusedwheretheymayenterfood.Theysaythefirstlineofdefenseagainstpestsistocleantheplaceswherethefoodishandledorstored.　　Floors,foodpreparationsurfacesandtoolscanbedisinfectedwithchemicalslikechlorine,iodineorbromine.Foodcontainersshouldbestoredabouthalfameteroffthegroundandabouthalfameterawayfromanywalls.Storageareasshouldbekeptdryandclean.　　Containersforrawmaterialssuchasrice,wheat,etc.shouldbekeptclosedandclean.Anyfoodstuffsplitduringdeliveryorhandlingshouldbeclearedupbothinsideandoutsidethebuilding.Pestsenterabuildingfromtheoutside,sopayattentiontoouterwalls.Smallstonescanbeusedtocoverthegroundandblockthegrowthofplantsandthegrassshouldbekeptshorttodenypestsaplacetolive.　　Checkthatdoorsandwindowsarecompletelyclosed.Alsoanyholethatmightallowpeststoenterabuildingshouldbefilled.Ratscanenterthroughaholethesizeofacoin.Amousecanpassthroughaholehalfthatsize.　　Supervisorsshouldmakealistofpestcontrolmeasurestobetakenbyemployees.Thiswillaidtheeffortsandalsohelpprepareforanyinspections.Inmostcountries,thereisafoodanddrugadministrationbureau,orsomeagencywithasimilarname,whichenforcesrulesnationwide,responsibleforrulesabouttheuseofpesticides,etc.However,businesseswherefoodisstored,preparedorsoldmustalsofollowstateandlocalhealthlaws.Mostofthesegovernmentaldepartmentsorbureaushavetheirwebsiteswithinformationaboutfoodsafetypoliciesandotherissues.Peoplecaneasilyaccesstheinformation.　操作提示：通过题干后的下拉框选择题目的正确答案。Accordingtopestcontrolexperts,whyshouldpoisonsneverbeusedinfoodcompanies?   　A.Becausetheymayenterfood.　B.Becausetheymaykillrats.　C.Becausetheymaybeharmfultotheplants.2.Whatisthefirstlineofdefenseagainstpests?   　A.Tocheckthatdoorsandwindowsarecompletelyclosed.　B.Tocleantheplaceswherefoodishandledorstored.　C.Tofillanyholethatmightallowpeststoenterabuilding.3.Howcanfloors,foodpreparationsurfacesandtoolsbedisinfected?   　A.Withsmoke.　B.Withwater.　C.Withchemicals.4.Whyshouldattentionbepaidtoouterwalls?   　A.Topreventpestsfromenteringabuildingfromoutside.　B.Tokeepmoistfromenteringabuildingfromoutside.　C.Tostopsunraysfromenteringabuildingfromoutside.5.Whatdosethepassagemainlytalkabout?   　A.Whypoisonsshouldneverbeusedwheretheymayenterfood.　B.Whythegrowthofplantsshouldbeblockedandgrassbekeptshort.　C.Howtocontrolratsandinsectswithoutharmingthefood.