托福考试模拟试题测试托福考试模拟试题测试2017超越自我防分化，挑战极限谱新高。下面是小编为大家搜索整理的托福考试模拟试题测试2017，希望大家能有所收获，更多精彩内容请及时关注我们应届毕业生考试网!CrowsareprobablythemostfrequentlymetandeasilyidentifiablemembersofthenativefaunaoftheUnitedStates。Thegreatnumberoftales，legends，andmythsaboutthesebirdsindicatesthatpeoplehavebeenexceptionallyinterestedinthemforalongtime。Ontheotherhand，whenitcomestosubstantiveparticularlybehavioralinformation，crowsarelesswellknownthanmanycomparablycommonspeciesand，forthatmatter，notafewquiteuncommonones：theendangeredCaliforniacondor，tociteoneobviousexample。Therearepracticalreasonsforthis。Crowsarenotoriouslypoorandaggravatingsubjectsforfieldresearch。Keenobserversandquicklearners，theyareastuteabouttheintentionsofothercreatures，includingresearchers，andadeptatavoidingthem。Becausetheyaresonumerous，active，andmonochromatic，itisdifficulttodistinguishonecrowfromanother。Bands，radiotransmitters，orotheridentifyingdevicescanbeattachedtothem，butthisofcourserequirescatchinglivecrows，whoareamongthewariestandmostuntrappableofbirds。Technicaldifficultiesaside，crowresearchisdauntingbecausethewaysofthesebirdsaresocomplexandvarious。Aspreeminentisgeneralists，membersofthisspeciesingeniouslyexploitagreatrangeofhabitatsandresources，andtheycanquicklyadjusttochangesintheircircumstances。Beingsoeducable，individualbirdshavemarkedlydifferentinterestsandinclinations，strategiesandscams。Forexample，onepetcrowlearnedhowtoletadogoutofitskennelbypullingthepinonthedoor。Whenthedogescaped，thebirdwentintothekennelandateitsfood。22。Whatisthemaintopicofthepassage?(A)Thewaysinwhichcrowsdifferfromothercommonbirds(B)Themythsandlegendsaboutcrows(C)Thecharacteristicsthatmakecrowsdifficulttostudy(D)Theexistingmethodsforinvestigatingcrowbehavior23。Accordingtothefirstparagraph，whatevidenceistherethatcrowshaveinterestedpeopleforalongtime?(A)Thelargenumberofstoriesaboutcrows。(B)Thefrequencywithwhichcrowsaresighted(C)Theamountofresearchthathasbeenconductedoncrows(D)Theeasewithwhichcrowsareidentified24。Theword“comparab