英语二 unit2 课件

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1、b02-A.BlackHoles复习UNIT1:TEXTB词组:bb1.toapplyfor/to2.day-to-day3.tohavenoidea4.totakethetroubletodosth.5.toputoneselfinsb’splace6.toone’sadvantage/disadvantage7.atadisadvantage8.toaskfor9.inhand10.tomakesureof/that11.toturndown12.assoonasbb第1段Whatisablackhole?Well,i

2、t'sdifficulttoanswerthisquestion,sincetheterms(that/which)wewouldnormallyusetodescribeascientificphenomenonareinadequate（a.不适当的）here.Astronomersandscientiststhinkthatablackholeisaregionofspace(notathing)intowhichmatterhasfallenandfromwhichnothingcanescape----notev

3、enlight.Sowecan'tseeablackhole.Ablackholeexertsastronggravitationalpullandyetithasnomatter.Itisonlyspace--orsowethink.Howcanthishappen?1.exert:vt.尽（力）；发挥（威力）；施加（压力）；产生（影响）；行施（职权）例句：见书P34.2.orsowethink:我们就是这样认为的。本句不表倒装，表对同一事实的确信、证实之意。比较：Youaskedhimtoleave,sodidI.你要

4、他离开，我也要他离开。Youaskedmetoleave,soIdid.你要我离开，我这样做了。ØAstronomersandscientiststhinkthatablackholeisaregionofspace(notathing)intowhichmatterhasfallenandfromwhichnothingcanescape–notevenlight.天文科学家和科学家认为黑洞是一个空间区域（而不是某个东西），物质掉进去就难逃罗网，甚至连光也跑不了。关系代词在从句中作介词宾语时，若介词随着关系代词提前，关系

5、代词不能使用that,若介词不提前，则不受此限制。例如：Ididn'tknowthematterthat/whichyoureferredto.我不知道你说的那件事。bb第2段Thetheoryisthatsomestarsexplodewhentheirdensityincreasestoaparticularpoint;theycollapseandsometimesasupernovaoccurs.Fromearth,asupernovalookslikeaverybrightlightintheskywhichsh

6、ineseveninthedaytime.Supernovaewerereportedbyastronomersintheseventeenthandeighteenthcenturies.SomepeoplethinkthattheStarofBethlehem（圣诞星）couldhavebeenasupernova.ThecollapseofastarmayproduceaWhiteDwarforaneutronstar--astar,whosematterissodensethatitcontinuallyshrin

7、ksbytheforceofitsowngravity.Butifthestarisverylarge(muchbiggerthanoursun)thisprocessofshrinkingmaybesointensethatablackholeresults.Imaginetheearthreducedtothesizeofamarble,butstillhavingthesamemassandastrongergravitationalpull,andyouhavesomeideaoftheforceofablackh

8、ole.Anymatterneartheblackholeissuckedin.Itisimpossibletosaywhathappensinsideablackhole.Scientistshavecalledtheboundaryareaaroundtheholethe"eventhorizon.