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【Readingcomprehension.Theoldbeliefthattheuniverseneverchangesisquitewrong.Evenbeforetheinventionofthetelescopeastronomersnoticedthatbrightstarssuddenlyappearedintheskyandthenlaterdisappeared.Thesestars】
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问题描述:

Readingcomprehension.

Theoldbeliefthattheuniverseneverchangesisquitewrong.Evenbeforetheinventionofthetelescope

astronomersnoticedthatbrightstarssuddenlyappearedintheskyandthenlaterdisappeared.Thesestars

werecalled"novae"becausetheywerethoughttobenew.Infactwenowknowthattheyarereallyoldstars

whichareslowlydying.

Novaeareoldstarswhichareslowlydying.Astheydosotheyletouthugecloudsofmaterialsometimes

aslargeastheearthandtheseexplodeintospaceataspeedofabout8000000kilometersperhour.When

thishappensthehotterpartsofthestarbecomevisibleandthisiswhynovaearesobright.Althoughthe

explosionsaresohugeonahumanscaletheyonlyconsumeasmallpartofthedyingstar'senergy.Thedeath

isaslowoneandthestarmaycontinuetoexplodeforthousandsofyears.Indeedthereareevensomestars

whichexplodeonceeverytwoweeks.

Thereareotheroldstarswhichdonotdieslowlybutarecompletelydestroyedbyonegreatexplosion.

Theseareknownas"supernovae".Theexplosionofasupernovaeisequivalenttoaboutamillionmillion

millionmillionhydrogenbombsgoingoffatthesametime.Justbeforetheexplosionthestar'sdensitybecomes

verygreatanditspinsataveryhighspeed.Amatchboxofmaterialstakenfromthestaratthattimewould

weighabout1000tonsandthestarwouldbeturningatabout16000000kilometersperhour.Theexplosion

itselfoccurssuddenlyintheintervalofaminutebutthesupernovaecontinuestoshinelongaftertheevent.

OnesupernovaewhichChineseastronomersobservedin1054canstillbeseenbyustoday.Ithasbeenshining

foratleastninehundredyears.

1.Novaewereoriginallythoughttobe_____.

A.starsthatdisappearsuddenly

B.starsthatexplode

C.newstars

D.dyingstars

2.Supernovaearedifferentfromnovaebecause_____.

A.theyaredyingstars

B.theydiegradually

C.theycanbeseenfromtheearth

D.theyexplodesuddenly

3."Astheydoso"(line1Paragraph2)means_____.

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《【Readingcomprehension.Theoldbeliefthattheuniverseneverchangesisquitewrong.Evenbeforetheinventionofthetelescopeastronomersnoticedthatbrightstarssuddenlyappearedintheskyandthenlaterdisappeared.Thesestars】|小学英语问答-字典翻译问答网》
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