完形填空(10小题,每小题1分,共10分)
Alllivingthingsontheearthneedotherlivingthingstolivewith.Nothinglives.Sometimesonelivingthingkills.Eachkindoflifeeatsanotherkindoflifeliveandtogethertheyformafoodchain(食物链).Somefoodchainsaresimplewhileothersarenot.Butfoodchainsbeginwiththesunandallfoodchainsbecomeifoneofthelinksdisappears.
Alllifeneedssunlighttoliveon.Butonlyplantscanusedirectly(直接地).Theymakefoodfromsunlightwaterairandsoon.Animalscanonlyusethesun’senergyithasbeenchangedintofoodbyplants.Someanimalsfeeddirectlyonplants.Otherseatsmalleranimals.Meat-eatinganimalsareonlyplantsindirectly.
Whatabouthumanbeings?Wearemembersofmanyfoodchains.Weeatwheatricevegetablesfruitandsoon.Wealsoeatmeatanddrinkmilk.Butoftenbreakupthefoodchains.Theykillwildanimals.Theyalsomakeriverslakesandseasdirty.Whentheseriverslakesandseasarepollutedthefishinthembeeaten.Ifpeopleeatthefishtheywillgetstrangediseases.
Eachformoflifeislinkedtoalltheothers.Breakingthelinksputsalllifeindanger.
1.A.aloneB.lonelyC.togetherD.happily
2.A.otherB.theotherC.anotherD.theothers
3.A.forB.sothatC.andD.inorderto
4.A.anyB.allC.someD.most
5.A.betterB.brokenC.strongerD.nicer
6.A.moonlightB.laserlightC.sunlightD.brightlight
7.A.afterB.beforeC.untilD.bythetime
8.A.makingB.catchingC.eatingD.feeding
9.A.sunlightB.animalsC.plantsD.people
10.A.canB.cannotC.mustD.needn’t