高中英语unit4astronomythescienceofthestarssectionⅱthelanguagepointsofreading（第1课时）

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1、SectionⅡ　TheLanguagePointsofReading课时作业(一)Ⅰ　完形填空Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphereagainacts__1__ourprotectiveblanketon__2__.Lightgetsthrough,andthisisessential__3__plantstomakethefoodwhichwe__4__.Heat,__5__，makesou

2、renvironmenttolerableandsomeultraviolet(紫外线的)rayspenetratethe__6__.Cosmic(宇宙的)raysofvariouskindscome__7__theairfromouterspace,but__8__quantitiesofradiationfromthesunarescreenedoff.__9__menleavetheatmospheretheyare__10__tothisradiation,__11__theirspacesuitsorthewallsoftheirspacecraft,ift

3、heyareinside,__12__preventalotofradiationdamage.Radiationisthegreatestknowndangertoexplorersin__13__.Dosesofradiationaremeasuredin__14__called“rem(雷姆)”.Weall__15__radiationhereonearthfromthesun，fromcosmicraysandfromradioactiveminerals.The“__16__”doseofradiationthatwereceiveeachyearisabo

4、uttwomillirems.It__17__accordingtowhereyoulive,andthisisaveryroughestimate.Scientistshavethereasontothink__18__amancan__19__farmoreradiation__20__0.1remwithoutbeingdamaged.Thefigureof60remshasbeenagreedon.篇章导读：本文是一篇说明文。太阳和其他星体发出的射线对人类既有利又有弊，那么大气层对此又是如何起作用的呢？人们能承受的安全射线数是多少雷姆呢？　1．A.forB．w

5、ithC．onD．as答案：D　actas“充当，起……作用”。句意：大气层再次对我们起到防护的作用。2．A.starsB．sunC．earthD．space答案：C　由上题可知，大气层起到防护的作用，保护的应该是地球。故选C项。3．A.withB．fromC．underD．for答案：D　beessentialfor“对……来说是首要的/基础的”，为固定搭配。4．A.useB．liveC．eatD．get答案：C　由常识可知，植物依靠阳光来生长出我们吃的食物，故选C项。5．A.againB．alsoC．besidesD．too答案：D　also一般紧跟动词；besi

6、des一般用在句首；too可用在句中，用逗号隔开。此处指热量也使得我们的生活环境温度适宜。6．A.environmentB．spaceC．atmosphereD．earth答案：C　由第1空所在的句子可知，地球周围有大气防护层，因此推知这里紫外线穿透大气层。故选C。7．A.acrossB．toC．fromD．through答案：D　这里的comethrough相当于penetrate“穿透”。comeacross“偶遇”；cometo“来到”；comefrom“来自”。句意：各类来自外太空的宇宙射线穿透大气层。故选through。8．A.validB．enormous

7、C．variousD．proper答案：B　由空格前but表转折和句末的“arescreenedoff(被隔开)”可判断此处表述大量的来自太阳的辐射被隔离掉了。valid“有效的”；various“各种各样的”；proper“合适的”。enormous“大量的”符合文意。9．A.AssoonasB．AswellasC．AsmuchasD．Aspossibleas答案：A　assoonas“一……就……”。此处表述人一离开大气层就会接触到射线。故选A项。10．A.shownB．exposedC．facedD．covered答案：B　beexposedt