unit5单元检测（北师大版必修2）

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1、Ⅰ.完形填空Generally，acomputerisanydevicethatcanperformnumericalcalculations.__1__，however，thetermusuallyreferstoanelectronicdevicethatcan__2__aseriesoftasksaccordingtoa__3__setofinstructions.In1953therewereonlyabout100computersinuseinthe__4__world.Todayhundredsofmillionsofcomputersarebeingus

2、edinhomes，schools，businesses，governmentoffices，anduniversitiesforalmostevery__5__purpose.Moderndesktoppersonalcomputers，orPCs，aremanytimesmore__6__thanthehuge，milliondollarbusinesscomputersofthe1960sand1970s.MostPCscanperformfrom400milliontoseveralbillion__7__persecond.Thesecomputersareu

3、sednotonlyforhousehold__8__andpersonalentertainment，butalsoformostoftheautomatedtasks__9__bysmallbusinesses.Thefastestdesktopcomputersarecalledworkstations，andtheyare__10__usedforscientific，engineering，oradvancedbusiness__11__.Thespeedandpowerofsupercomputers，thefastestclassofcomputer，ar

4、ealmostbeyondhumancomprehension，andtheir__12__arecontinuallybeing__13__.Thefastestofthesemachinescanperformmorethan7trillionandtheoreticallycanrunmorethan12trillionoperationspersecondandcanstore6trillioncharactersinitsmemory，allowingittodotheworkofthousandsofPCs.Supercomputers__14__these

5、speedsthroughtheuseofseveraladvancedengineeringtechniques.Becausetheycancostbillionsofdollarsandbecausetheycanbelargeenoughtocoverthesizeoftwobasketballcourts—supercomputersareused__15__bygovernmentagenciesandlargeresearchcenters.1．A.Currently　　　　　B．ConsequentlyC．CertainlyD．Clearly解析：选A。

6、Currently目前。该句的意思是：一般来说，任何可以执行数字计算的装置都可以称为计算机。但是，现在，这个词一般是指能够按照一系列精确的指令执行一系列任务的电子装置。B.Consequently“后来”；C.Certainly“当然”；D.Clearly“很明显地”。从逻辑关系上来看，只有Currently最合适。2．A.performB．conductC．achieveD．fulfill解析：选A。perform“做；执行；表演；指挥；操作”；B.conduct“行为；处理；引导；指挥；导电”；C.achieve“完成，达到”；D.fulfill“实践，履行，实行，

7、结束，满足，完成，达到”，只有A符合文意。3．A.rigidB．seriousC．preciseD．harsh解析：选C。precise精确的，准确的，符合文意。A.rigid“刚硬的，刚性的，严格的”；B.serious“严肃的；认真的”；D.harsh“严厉的；残酷的；无情的”。4．A.entireB．completeC．totalD．general解析：选A。该句的意思是：在1953年，全世界只有大约100台计算机。“全世界”用entireworld。B.complete强调“完整性”；C.total强调“合计，总计”；D.gene