;OneofthemostwonderfulmigrationsinnatureisthatoftheNorthAmericanmonarchbutterfly.
oneof+adj./adv.最高级+n.复数(谓语动词用单数形式)
that指代前文提到的名词，这一用法可以使句子更加简洁，避免重复与累赘。
代词that/those/one/ones的区别
that指代的名词的修饰语往往是the/this/that;而one指代的名词的修饰语一般为a/an/some/any
Achairmadeofsteelisstrongerthanonemadeofwood.
Thewaterinthecupishotterthanthatinthepot.
;that指代可数名词单数和不可数名词，可数名词复数用those；one指代可数名词单数,可数名词复数用ones。
Ilikethispenmorethanthatone.
Therewereafewyoungpeopleandsomeolderonesinthehouse.
Mary’shandwritingisbetterthanthatofPeter.
Thesepicturesaremorebeautifulthanthose.
that指代事物或人，one只能指代人。
Heistheteacher,theonewhoislovedbythestudents.
Thebookonthetableismine,andthatisafiction.;PPT模板/moban/;PPT模板/moban/;2.AteamofscientistsledbyProfessorEliShlizermanattheUniversityofWashingtonhasnowfoundtheanswer.
华盛顿大学伊莱·席里哲曼教授领导的科学家研究小组现在已经找到了答案。
ledby…是一个非谓语动词，充当scientists的后置定语。
TellMarythatthereissomeone_______(wait)forheratthedoor.
Thereisadog______(tie)toafenceoutsidethehouse.
________(catch)theearlytrain,you’llhavetogetupearly.
Peoplearetalkingaboutthenewplay_________(puton)intwoweeks.
______(be)anurse,sheknewhowtotakecareofapatient.;3.Theycutdowntreesandusechemicalsthatkilltheplantsthatmonarchcaterpillarseat.
他们砍伐树木，使用能杀死黑脉金斑蝶幼虫食用的植物的化学药剂。
这句话包括两个关系代词that引导的定语从句，第一个that在从句中作主语，第二个that在从句中作宾语，可以省略。
Doyouknowthelady_________ourEnglishteacheristalkingtonow?
WearegoingtolearnsomeChinesepoems_________werewrittenintheTangDynasty.
Whenfacinghardship,onlythose______areconfidentwillachievesuccess.
;;4.Themoreweknowaboutthislovelycreature,thegreaterchanceitwillsurviveandkeepitsplaceinthenaturalworldforalongtimetocome.
the+比较级…,the+比较级…表示越…,越…
我们对这种可爱的生物了解得越多，它生存的机会以及在未来很长一段时间内保持它在自然界中的地位就越大。
________(much)youpractice,________(good)youwills