2021届新高考英语二轮复习艺体生专用课件:课时作业19 高考综合训练(二).ppt
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2021届新高考英语二轮复习艺体生专用课件:课时作业19 高考综合训练(二).ppt

2021届新高考英语二轮复习艺体生专用课件:课时作业19高考综合训练(二).ppt

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课时作业19第一部分阅读理解第一部分阅读理解Andunplannedhumanactivitieshaveprovedtheideaoftop-downcontrolbytoppredatorstobetrue.Intheocean,wefishedfortoppredatorssuchascodonanindustrialscale,whileonland,wekilledofflargepredatorssuchaswolves.Theseactionshavegreatlyaffectedtheecologicalbalance.Scientistshavebuiltanearly-warningsystembasedonmathematicalmodels.Ideally,thesystemwouldtelluswhentoadapthumanactivitiesthatarepushinganecosystemtowardabreakdownorwouldevenallowustopullanecosystembackfromtheborderline.Preventioniskey,scientistssay,becauseonceecosystemspasstheirtippingpoint(临界点),itisremarkablydifficultforthemtoreturn.1.Whathavescientistsdiscoveredwiththehelpofmathematicalmodelsoffoodwebs?A.Thelivinghabitsofspeciesinfoodwebs.B.Therulesgoverningfoodwebsoftheecosystems.C.Theapproachestostudyingthespeciesintheecosystems.D.Thedifferencesbetweenweakandstronglinksinfoodwebs.2.Astronglinkisfoundbetweentwospecieswhenapredator.A.hasawidefoodchoiceB.caneasilyfindnewpreyC.stickstoonepreyspeciesD.canquicklymovetoanotherplace3.Whatwillhappenifthepopulationsoftoppredatorsinafoodwebgreatlydecline?A.Thepreyspeciestheydirectlyattackwilldieout.B.Thespeciestheyindirectlyattackwillturnintotoppredators.C.Thelivingenvironmentofotherspecieswillremainunchanged.D.Thepopulationsofotherspecieswillexperienceunexpectedchanges.4.WhatconclusioncanbedrawnfromtheexamplesinParagraph4?A.Uncontrolledhumanactivitiesgreatlyupsetecosystems.B.Rapideconomicdevelopmentthreatensanimalhabitats.C.Speciesofcommercialvaluedominateotherspecies.D.Industrialactivitieshelpkeepfoodwebsstable.5.Howdoesanearly-warningsystemhelpusmaintaintheecologicalbalance?A.Bygettingillegalpracticesundercontrol.B.Bystoppingusfromkillinglargepredators.C.Bybringingthebroken-downecosystemsbacktonormal.D.Bysignalingtheurgentneedfortakingpreventiveaction.B[2019·浙江6月高考]Moneywithnostringsattached.It’snotsomethingyouseeeveryday.ButatUnionStationinLosAngeleslastmonth,aboardwentupwithdollarbillsattachedtoitwithpinsandasignthatread,“GiveWhatY
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