2019-2020年高中英语Unit4ExploringplantsUsingLanguage课时跟踪训练新人教版

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1、2019-2020年高中英语Unit4ExploringplantsUsingLanguage课时跟踪训练新人教版Ⅰ.单词拼写1．Thedevelopmentalhistoryofthesocietytellsusthatmanhasevolved(进化)fromtheape.2．Let'sattach(系)labelstotheluggage.3．Heboughtavasewithadelicate(精致的)patternofbutterfliesandleaves.4．Thisisatypical(有代表性的)caseinmydailywork.5．Theairint

2、hegardenwaswarmandfragrant(芬芳)．Ⅱ.单句改错1．Heattachedhishorseonatree.on→to2．Themachinegaveupasteadybuzzing.up→out3．ThisisthegirlwhonameisLiuHui.who→whose4．Healwayspassesbyatthesightofblood.by→out5．Thatregionhasplentyofnaturalresourcessincethisonehasnone.since→whileⅢ.阅读理解Plants,likeanimals,are

3、easytobeinfectedbydiseasesofvariouskinds.Ithasbeenestimatedthatsome30,000differentdiseasesattackoureconomicplants:fortyareknowntoattackcorn,andaboutasmanyattackwheat.Theresultsofuncheckedplantdiseasearealltooobviousincountrieswhichhaveonlyalimitednumberoffoodsupplies.Theproblemwillsoonbem

4、orewidespreadasthepopulationoftheworldincreasesatitsfrighteningrate.Evenincountrieswhicharenowamplyfedbytheiragriculturalproducts,therecouldsoonbeseriousfoodshortages.Itiseasytoimaginetheouteofsomedisastrousattackononeofthemajorcrops;theresultingfaminescouldkillmillionsofpeople,andtheresu

5、ltinghardshiponothermillionscouldcausepoliticaldisturbancedisastroustotheorderoftheworld.Someplantsarebornwiththeabilitytoresistagreatmanydiseases,whileothersarefairlyeasytobeinfected.Thetolerance(耐受性)ofaparticularplantchangesasthegrowingconditionschange.Ablight(枯萎病)maybebutalocalinfectio

6、nwhichcanbeeasilycontrolled;ontheotherhand,itcanattackparticularplantsinawholeregionornation.AnexampleistheblightwhichkilledactuallyeverychestnuttreeinNorthAmerican.AnotheristhefamouspotatoblightinIrelandinthelastcentury.Asaresultofthat,itwasestimatedthatonemillionpeoplediedofstarvationas

7、potatoeswerethemainfoodforIrishpeople.Plantpathologistshavemaderemarkableprogressinidentifyingthepathogens(病原体)ofthevariousdiseases.Bacteriamayinvadeaplantbywayofinsectscarryingthepathogen.Aplantcanalsobeinoculatedbyman.Frequentlyaprimaryinfectionwillweakentheplants