当前位置 :
【阅读理解SometimesinthemonthofNovemberaspecialeventhappensintheskythatobserversmayrememberforalifetime.Theeventismorethanameteorshower(流星雨).Itisameteorstorm.Meteorsarepieces】
更新时间:2024-04-26 15:04:13
1人问答
问题描述:

阅读理解

SometimesinthemonthofNovemberaspecialeventhappensintheskythatobserversmayrememberforalifetime.Theeventismorethanameteorshower(流星雨).Itisameteorstorm.

Meteorsarepiecesofrockfromspacethatburnupinouratmosphere(大气).MeteorshowershappenwhentheEarthpassesthroughalargeamountofspacematerialduringitsorbit(按轨道运行)aroundthesun.

Howeverthousandsofmeteorsfallduringameteorstorm.Someofthemmaybrieflyshinebrighterthananystarinthesky.

TheLeonidmeteorshowerhappenseveryNovember.Inmostyearsitisnotunusual.Leonidmeteorsfallatanaveragerateofonlyfifteeneachhour.Buteverythirty-threeyearsartobjectpassesthroughoursolarsystem(太阳系)thatchangestheLeonidmeteorshower.

Acomet(彗星)isalargebodyofgasiceandrock.Cometsleavebehindthesematerialsastheyorbitthesun.EachyeararoundNovember18ththeEarthpassesthroughmaterialleftbehindbyacometcalledTempel-Tuttle.

IntheFebruaryof1998cometTempel-Tuttlereturnedtotheinnersolarsystem.Astronomers(天文学家)havefoundthattheLeonidmeteorshowercanbecomeveryactiveforaboutfiveyearsaftertheappearanceofthatcomet.

AstronomersalsohavediscoveredthateachappearanceofcometTempel-Tuttleleavesbehindadifferentpathofmaterial.ThisdiscoveryhaspermittedastronomerstoknowwhentheLeonidmeteorshowermaybemostintense.SomeastronomersbelievetheLeonidsthismonthmaybeameteorstorm.

In1833observersintheeasternUnitedStatessawanintensemeteorstorm.Onepersonestimatedthatmeteorsfellatarateoften-thousandanhouraboveWestPointNewYork.In1966peopleinthewesternUnitedStatessawanotherintenseLeonidmeteorstorm.

ThisyearastronomersbelievethattherewillhetwoperiodsofheavymeteoractivitystartingonNovember18th.AtTenHoursUniversalTimeobserversinNorthAmericashouldseealargenumberofmeteors.

AnotherperiodofmeteoractivityshouldhappenataboutEighteenHoursUniversalTime.ObserversinEastAsiaandwesternAustraliawillseeitbest.AstronomerswhohaveresearchedtheLeonidssaythebestchancetoseeameteorstormmayhethisyearandnextyear.

1.Thispassagemainlytell

孙勇回答:
  答案:C;D;C;A解析:1.C 导全文进述关于彗星与流星雨的形成,提到Leonid及Tempel-Tuttle,因此选C.2.D 导第一段的special,rememberforalifetime等处均表明D为正确项.3.C 导从...
最新更新
查询网(ip1138.com)汇总了汉语字典,新华字典,成语字典,组词,词语,在线查字典,中文字典,英汉字典,在线字典,康熙字典等等,是学生查询学习资料的好帮手,是老师教学的好助手。
声明:本网站尊重并保护知识产权,根据《信息网络传播权保护条例》,如果我们转载的作品侵犯了您的权利,请在一个月内通知我们,我们会及时删除。

邮箱:  联系方式:

Copyright©2009-2021 查询网 ip1138.com 版权所有 闽ICP备2021002823号-3