高中英语unit4exploringplantsusinglanguage课时跟踪训练新人教版

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1、Unit4ExploringplantsUsingLanguageⅠ.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．Theai

2、rinthegardenwaswarmandfragrant(芬芳)．Ⅱ.单句改错1．Heattachedhishorseonatree.on→to2．Themachinegaveupasteadybuzzing.up→out3．ThisisthegirlwhonameisLiuHui.who→whose4．Healwayspassesbyatthesightofblood.by→out5．Thatregionhasplentyofnaturalresourcessincethisonehasnone.since→w

3、hileⅢ.阅读理解APlants,likeanimals,areeasytobeinfectedbydiseasesofvariouskinds.Ithasbeenestimatedthatsome30,000differentdiseasesattackoureconomicplants:fortyareknowntoattackcorn,andaboutasmanyattackwheat.Theresultsofuncheckedplantdiseasearealltooobviousincountrieswh

4、ichhaveonlyalimitednumberoffoodsupplies.Theproblemwillsoonbemorewidespreadasthepopulationoftheworldincreasesatitsfrighteningrate.Evenincountrieswhicharenowamplyfedbytheiragriculturalproducts,therecouldsoonbeseriousfoodshortages.Itiseasytoimaginetheoutcomeofsome

5、disastrousattackononeofthemajorcrops;theresultingfaminescouldkillmillionsofpeople,andtheresultinghardshiponothermillionscouldcausepoliticaldisturbancedisastroustotheorderoftheworld.4Someplantsarebornwiththeabilitytoresistagreatmanydiseases,whileothersarefairlye

6、asytobeinfected.Thetolerance(耐受性)ofaparticularplantchangesasthegrowingconditionschange.Ablight(枯萎病)maybebutalocalinfectionwhichcanbeeasilycontrolled;ontheotherhand,itcanattackparticularplantsinawholeregionornation.Anexampleistheblightwhichkilledactuallyeveryche

7、stnuttreeinNorthAmerican.AnotheristhefamouspotatoblightinIrelandinthelastcentury.Asaresultofthat,itwasestimatedthatonemillionpeoplediedofstarvationaspotatoeswerethemainfoodforIrishpeople.Plantpathologistshavemaderemarkableprogressinidentifyingthepathogens(病原体)o

8、fthevariousdiseases.Bacteriamayinvadeaplantbywayofinsectscarryingthepathogen.Aplantcanalsobeinoculatedbyman.Frequentlyaprimaryinfectionwillweakentheplantsothatasecondaryinfe