一道英语题，

Haveyoueverseenagreenhouse?Mostgreenhouseslooklikeasmallglasshouse．

Greenhousesareusedtogrowplants，especiallyinwinter．Greenhousesworkbytrappingheatfromthesun，theglasspanels(板)ofthegreenhouseletlightin，butkeepheatfromescaping．Thiscausesthegreenhousetoheatup，muchliketheinsideoftheparkedinsunlight，andkeepstheplantswarmenoughtoliveinwinter．

Theearth'satmosphere(大气)isallaroundus．Itistheairthatwebreathe．Greenhousegasesintheatmospherebehavemuchliketheglasspanelsinagreenhouse．SunlightenterstheEarth'satmosphere，passingthroughtheblanketofgreenhousegases．AsitreachestheEarth'ssurface，land，water，andbiosphere(生物圈)，theytakeupthesunlight'senergy．Oncetheheatistakenup，thisenergyissentbackintotheatmosphere．Someoftheenergypassesbackintospace，butmuchofitremainstrappedintheatmospherebythegreenhousegases，causingourworldtoheatup．

Thegreenhouseeffectisimportant．Withoutthegreenhouseeffect，theEarthwouldnotbewarmenoughforhumanstolive．Butifthegreenhouseeffectbecomesstronger，itcouldmaketheearthwarmerthanusual．Evenalittleextrawarmingmaybringproblemstohumans，plants，andanimals．

根据短文内容，回答下列问题。

1．Whataregreenhousesusedfor?

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2．Whyisthetemperatureinthegreenhousehigherthanthatoutside?

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3．Whatbehavesmuchliketheglasspanelsinagreenhouse?

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4．Ifwedidn'thavethegreenhouseeffect，whatwouldhappen?

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5．Whatdoesthearticlemainlytellus?

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答案：

1．Theyareusedforgrowingplants．答案来自第二段的第一句。

2．根据短文第二段中温室效应的工作原理可知，答案是Becausetheglasspanelsofthegreenhousecanletlightin，andkeepheatfromescaping．

3．根据短文第三段的“muchofitremainstrappedintheatmospherebythegreenhousegases”可知，温室塑料板的作用像空中大气层的作用，即答案是Greenhousegasesintheatmosphere．

4．根据最后一段内容可知，如果没有大气层的温室效应，人类就不能生存，即答案为Humanscouldn'tlivebecausetheearthwouldnotbewarmenough．

5．根据全文内容可知，主要是温室效应及对人类的影响，所以答案为Itmainlytellsuswhatthegreenhouseeffectisanditsinfluence．