...of deer? Give the seedling bad breath! The same chemical...

来自 : www.sqjob.cn/tiku/jxxw11754... 发布时间：2021-03-24

What.sthebestwaytoprotect,atender,greenseedlingfromthehungrystomachofdeer?Givetheseedlingbadbreath!Thesamechemicalthatgivespeoplebadbreathaftertheyhaveeatengarliccansavesmalltreesfrombeingeatenbyanimals.Akindofchemicalselenium(硒),whichisalsofoundingarlic,isplantedinthesoilnearayoungtree.Thetree.srootsabsorbtheselenium,whichisthencarriedtotheleaves,Fromtheretheseleniumisusedtoformachemicalcalleddimethyselenide(乙烷硒化物)---thesamechemicalmadeinthehumanmouthaftereatinggarlic.Asdeerwanderaroundlookingforfood,theysmelltheseedlings.leavesandleavetheplantsalone.Theseleniumisimportant.Why?Becauseeachyeardeereatmillionsofdollars.worthoftreesfarmseedlings.Sofar,seleniumhasbeentestedonlyonDouglasfir(枞树)seedlings,butresearchersthinktheycouldprotectfruittreesandgardenplants,too.1.Whenpeopleeatgarlic,______.A.theysendoutahorriblesmellB.theyareoutofbreathC.theywillfeelsickD.itishardforthemto.breathe2.Accordingtothispassagethebadsmellgivenofffromthoseleavesisthatof______.A.seleniumB.dimethyselenideC.deerD.ayoungtree3.Thedeerdon.ttouchthoseyoungtreesbecause______.AtheyoungtreesabsorbgarlicB.therootsoftheyoungtreessmelllikegarlicC.theyoungtreearen.tfitforthedeertoeatD.theleavesoftheyoungtreessmelllikegarlic4.Uptillthetimethenewswasannounced,thiskindofchemicalwasused______.A.allovertheworldB.allovertheUnitedStatesC.onfruittreesandgardentreesD.onDouglasfiryoungtrees5.Thebesttitleofthispassageis______.A.HungryDeerandYoungTreesB.WhyDon.tDeerEatyoungFruitTreesC.PlantsSavedby\"BadBreath\"D.HowtoProtectYoungTrees