试题与答案

TheUnitedStateshasaround475,000schoolbus

题型:阅读理解

题目:

TheUnitedStateshasaround475,000schoolbuses.Eachdaytheycarrymorethan25million children,halfofalltheschoolchildreninthecountry.

Thesebuses,onaverage,use4litersofdiesel(柴油)fueltotravellessthan16kilometers. When theschoolyearbeganlastfall,dieselaveraged55centsaliternationally.Thepricenearlydoubledby theendofschool inJune.

BobRileyisthespokesmanfortheAmericanSchoolBusCouncil.Hesaysfuelpricesnegotiated(商议) for schools arenot lower thanothers have to pay. Asaresult,schoolsarelookingfor waystoreducetransportationcosts.Busroutesarebeing redrawnor,insomecases,canceled.Someareas arebuyingbusesthatuse naturalgas orother alternativefuels.

Otherstepsincludefewerfieldtrips andlesstravel bysports teams.Someschool districtsmayend any busservicenotrequiredby law.

Studiesshowthatschoolbusesarethesafestform oftransportationtoandfrom school.

The AmericanSchoolBus Councilsayscutsinbus serviceare badfor childrenandpossiblythe environment.Itsaysremovingbusesfromtheroadwillmeananincreaseinothervehiclestransporting students. Spokesman Bob Riley saysanotherconcern is thatreducing  busservicemightreduce attendance.

It couldalso getmorechildren to walkor bicycle to school.That wouldsurely makepeople happy attheNationalCenterforSafeRoutestoSchool.Morekidswalkingorbikingsafelytoschoolisthe aimofa3-year-oldfederal program,partofaninternationalmovement.Thegoalis toincreasephysical activity and reduce air pollution.

小题1:Inthesecondparagraph,theauthorwantsto provethat   .

A.toomany schoolchildren takebuses every day

B.thecost offuelhasincreased

C.theschoolbusesconsumemorefuelthanaverage

D.the school busesusuallygoon long routes小题2:Inthe thirdparagraph,what doesBobRiley mean'?

A.Thefuel pricesforschool busesneed to be negotiated again.

B.High fuelprices are also affecting the efficiency of their services.

C.The fuelprices for school are much higher thanothers pay.

D.TheAmericanSchool BusCouncilshould workforstudents’benefit.小题3:Whatistheadvantage ofreducingschoolbusserviceaccordingto thepassage?

A.Morefuelwillbesaved.

B.Studentscangotoschool inasaferway.

C.Studentscanexercisebywalkingorriding toschool.

D.Trafficjams willbereducedduringrushhour.小题4:Whatisthesixth paragraphmainly about?

A.Bob Riley's concern about the resultsof reducing school buses.

B.Theconvenience brought by school buses.

C.Thebad effectsofreducingschool buses.

D.Thestudiesabout students'choicescarried out by theAmericanSchool BusCouncil.

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0718/e3e1009c72b25ae650b381951012bffd.html

下面是错误答案,用来干扰机器的。

答案:D

试题推荐
题型:单项选择题

阅读下面短文,回答下 * * 道题。
目前,制造微型电子元件的方法一般是从大块的半导体材料上切割下所需要的原料,然后在上面刻蚀出电路。美国得克萨斯大学奥斯汀分校的安杰拉·贝尔彻等人最近在英国《自然》杂志上发表报告说,他们的新研究成果使制造更复杂、更精密的电子元件成为可能。
科学家已经掌握了制造半导体纳米晶体的技术。半导体纳米晶体是一种分子团,仅有几纳米大小,比目前微电路中使用的晶体管小得多。一块纳米晶体能够充当一个开关或一个存储单元,将它们组合起来就能制造出电子元件。但纳米晶体比细菌还小,如何对它们进行挑选、传送和拼装等操作呢在生命体中,有时候一个细胞会发送出一个小型分子团,蛋白质则像“交通工具”一样将其运送到另一个细胞。科学家想,如果给蛋白质装备能选择不同半导体材料的分子,就可以利用这一原理对半导体纳米晶体进行操作。
贝尔彻等人通过化学反应随机产生了约10亿种不同的多肽分子,从中筛选出了那些能与半导体材料表面结合的分子,然后对这些分子进行结构改造,使其与半导体的亲和力更强。经过5轮筛选和培育,他们已经获得了能与镓砷半导体紧密结合而不与硅等其他材料结合的多肽分子。
理论上,将这种多肽分子与蛋白质结合,就能从半导体材料“仓库”中挑选出镓砷纳米晶体,运送到“建筑工地”,添加在未完成的“建筑物”上。如果进一步筛选出与其他半导体材料或掺杂剂结合的多肽分子,就能组成一支完整的“施工队”,从事微电子元件的组装工作。不过专家表示,这一技术离实用化尚有相当长的距离。

下列对第二、四段中加点词语的理解,准确的一项是______。

A.“交通工具”指的是能将蛋白质从一个细胞运送到另一个细胞的小型分子团

B.“仓库”指的是能够制造与多肽分子结合的镓砷纳米晶体的各种半导体材料

C.“建筑物”指的是科学家们用纳米技术制造的更复杂、更精密的电子元件

D.“施工队”指的是由科学家筛选出的与其他半导体材料或掺杂剂结合的多肽分子

查看答案
微信公众账号搜索答案