book3 unit8课后答案

《book3 unit8课后答案》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、SectionASectionBSectionC83CheckYourself1.Trytocompletethesentenceswithwhatyoulearnedfromthetext.1)CarlSagan’sopinionaboutotherintelligentlifeinuniverseis.thatwemusthavemanyneighborsouttheresomewhere2)AftertheTunguskaExplosionthelocalssaw.thatsomethingbrig

2、htbluestreaktowardtheareaandexplodewithincredibleforceII.ReadingComprehensionSectionA—CheckYourself833)Matterandare,intheory,created.Antimatters,atthesametimebythesameevent4)Darkmatterisatermreferringtosomethingthat.wehavenoideawhatitis5)Thesmartestguysin

3、theworldgetheadachesfromthisquestion.Thisquestionrefersto.whattimeisSectionA—CheckYourself382.Basedonwhatyouhavelearnedfromthetext,answerthefollowingquestionsbriefly.1)Theauthormentionedinthefirstparagraphthat“Therealmysteryisthis:whatisitaboutEarththatma

4、kesnooneintheuniversewanttoplaywithus?”Couldyoutellwhatthe“one”means?Whydidtheauthorsayso?CarlSagan’sopinionaboutotherintelligentlifeinuniverseisthatwemusthavemanyneighborsouttheresomewhere.SectionA—CheckYourself382)Couldyouunderstandinthethirdparagraph“M

5、atterandantimatterare,intheory,createdatthesametimebythesameevent”?Giveoneexampletoexplainthistheorye.g.Everycoinhastwosides.事物有正反两方面.TheNorthandSouthPolesarethetwopointsatoppositeendsoftheearth.南极和北极是地球上相对着的两点。SectionA—CheckYourself383)Whatisdarkmatter?H

6、owaboutdarkenergy?Darkmatterreferstotheenormousamountofmatterintheuniversebeyondwhatwecanactuallysee.Darkenergyissometypeofenergywhichwecannotperceivedirectly,accompanyingdarkmatter.SectionA—CheckYourself384)Couldtherepossiblyevenbea“before”beforethebegin

7、ningoftheuniverse?Shareyouropinions.SectionA—CheckYourself38II.VocabularyandStructureCollocationChoosethecorrectphrasetocompleteeachofthefollowingsentenceswithitsproperform.1)toknockdown/toknockoff(1)I’msorry.I_______glass____thetableandbrokeit.knockedthe

8、…off(2)Let's_______workearlyandgotothefootballgame.knockdownSectionA—CheckYourself38(3)Thisoldboxerhasnever__________byanopponent.beenknockeddown(4)Theboy___________byacar.wasknockedoffSectionA—CheckYourself382)fall