1、课时作业(八)必修2Unit 3 Computers限时：30分钟.单项填空12011四川卷 Im sorry I didnt finish it on time._AFine, thanks. BNo, thanks.CThanks a lot. DThanks anyway.2Maybe he really should do more exercises from now on. _， I hope he could get over soon.ASomehow BSomewhatCAnyway DAnywhere3Will you_ my clothes while I have a
2、swim？No problem.Awatch over Blook overCgo over Dthink over 4Toms boss gave him a long leave after the terrible accident._， he was fired.AAs a result BIn other wordsCOn the contrary DTo be honest5Italian Luca Parmitano, one of the European Space Agencys new astronauts, _ to go into orbit and live on
3、the International Space Station in 2013.Ahas been selected Bhas selectedCwill select Dwill be selected6The ballet Nutcracker will be put on next week. Why not join us to the theater？Well, not me. _.AThat is simply not my cup of teaBI cant wait to goCI just dont believe a single word of itDThat is no
4、t a point7_ the day went on, the weather got worse.AWith BSinceCWhile DAs8Hey！ Here is a message on my cell phone, telling me to send money toDelete it！ Its a trick. Many a person _ by such tricks.Ahas been cheated Bhave been cheatedCwere cheated Dwas cheated 9My friend Martin was very sick with a s
5、trange fever； _， he could neither eat nor sleep.Amoreover BhoweverCas a result Dfurthermore10The Great Wall is _ tourist attraction that millions of people pour in every year.Aso a wellknown Ba so wellknownCsuch wellknown Dsuch a wellknown11The dinner was delicious！I agree. I am so full.Thats too ba
6、d. But some dessert_.Ahas ordered Bwill be orderedChas been ordered Dwas going to be ordered12It is a truth _ acknowledged that when one has gained material wealth, hell surely seek for spiritual enjoyment.Apartly BuniversallyCparticularly Dpreviously13Im afraid that I cant finish the task as soon a
7、s planned._.ADont be afraid BDont mention itCI suppose so DTake your time14You look so worried. Whats the matter？I dont know_ these boring problems.Awhat to deal with Bhow to do withCwhat can I do with Dhow to deal with15Thats the third time hes won the award in this field.Yes. He _ his maximum pote
8、ntial in the past decade.Aexplored Bis exploringChas been exploring Dhas explored.阅读理解AMIT researchers and their colleagues are working to find out whether energy from trees can power a network of sensors (传感器) to prevent spreading forest fires. What they learn could also raise the possibility of us
9、ing trees as silent guards along the nations borders to discover potential threats such as smuggled (走私的) radioactive materials. The US. Forest Service currently predicts and tracks fires with a variety of tools, including remote automatic weather stations. But these stations are expensive and spars
10、ely (稀疏地) distributed. Additional sensors could save trees by providing better local climate data to be used in fire prediction models and earlier warnings. However, recharging or replacing batteries by hand at very hardtoreach locations makes it impractical and costly. The new sensor system seeks t
11、o avoid this problem by developing trees into a selfsustaining power supply. Each sensor is equipped with a battery that can be slowly recharged using electricity produced by the tree. “A single tree doesnt generate a lot of power, but over time the trickle (细流) charge adds up, just like _” said Shu
12、guang Zhang, one of the researchers on the project and the associate director of the MITs Center for Biomedical Engineering (CBE). The system produces enough electricity to allow the temperature and humidity sensors to wirelessly send out signals four times a day, or immediately if theres a fire. Ea
13、ch signal spreads from one sensor to another, until it reaches an existing weather station that sends the data by satellite to a forestry command center in Boise, Idaho. Scientists have long known that trees can produce extremely small amounts of electricity. But no one knew exactly how the energy w
14、as produced or how to take advantage of the power.16What are the disadvantages of the remote automatic weather stations？ a. They cost too much. b. They are of poor quality. c. They are not enough. d. They cant reach remote places.Aa, b Bb, d Ca, c Db, c17Which of the following is the best sentence t
15、o fill in the blank？ AFar water does not put out near fire. BAll rivers run into sea. CMany a little makes a mickle. DIt never rains but it pours. 18What Shuguang Zhang said in Paragraph 4 means that _. Aa single tree is enough to generate much power Bthe power from the tree cant be stored Ctrees ca
16、n generate enough power for our life Da tree can produce the electricity to meet the needs of a sensor19What would the author talk about after the last paragraph of the passage？AThe amount of electricity trees produce.BHow trees produce electricity.CTrees contribution to society.DThe research proces
17、s of tree power.20What would be the best title for the passage？APreventing forest fires with tree powerBTrees can produce electricityCTree power in daily lifeDDeveloping new energyBHow you end a computer session depends on how you use the computer, your views on energy conservation (能源的节约), and what
18、 you have been told about how your decision will affect your investments longevity： will frequent starting and stopping cause its circuits(电路) to burn out sooner？ Rest easy, your computer is more likely to be damaged by a virus picked up from the Internet than by being turned off and on too much. Th
19、ey are also energyefficient： such efficiency has reached the point where most computers place themselves in sleep mode if they remain idle (闲置的) for a certain period of time. So your computer will likely slip into sleep mode anyway, even if you leave it on overnight. Sleep mode itself, once a pretty
20、 unreliable optionyou never knew if you would be able to wake your computer without having to reboot (重新启动) ithas been vastly improved with newer operating systems. If you want your computer to consume as little energy as possible when not in use, shut it down. If you want it to consume zero energy,
21、 youre going to have to unplug (拔去的电源插头) it. Your computer can be in only three states： on, sleep or offeach of which draws some level of electric current.A computer that is “on” will either be actively processing information or sitting idle, depending on whether the user is typing a document, readi
22、ng an email or has stepped away briefly. The amount of wattage (瓦特数) drawn when the computer is on varies greatly depending on whether it is a laptop or a desktop computer. The latter uses more energy because desktop power supplies are less efficient and require a separate and often larger, powerhun
23、gry monitor. It also varies based on the type of work being done： complex calculations requiring intensive processing are more powerhungry, whereas writing or Web browsing consumes far less electricity.21If sleep mode goes wrong, what will probably happen to your computer？ AIt will consume as little
24、 energy as possible. BIt is more likely to be damaged by a virus picked up from the Internet. CIt will have to be rebooted when used again. DIt has to be shut down and unplugged.22Which of the following is NOT mentioned in the text that contributes to the different amount of energy a computer consum
25、es？ AWhether it is a laptop or a desktop computer. BWhat kind of work the computer is dealing with. CThe choice of how you use your computer. DWhether the operating systems are new.23When does a computer consume the most energy？ AWhen we let it remain idle. BWhen we use it to do complex calculations
26、. CWhen we use it to type some documents and email. DWhen we use it for surfing the Internet.24The reason why a desktop computer uses more energy than a laptop computer is that_. Aa desktop computers monitor is separate and often larger Ba desktop computer is larger than a laptop computer in size Ca
27、 desktop computer performs more kinds of work than a laptop computer Da desktop computer is not energyefficient25Which of the following is implied in the first two paragraphs？ AFrequent starting and stopping can damage a computer. BA computers longevity depends more on the proper way you use it. CA
28、virus picked up from the Internet is likely to damage a computer. DThe more often you use a computer, the more smoothly it works.课时作业(八).1.D考查交际用语。句意为：“很抱歉，我未能按时完成它。”“无论如何我还得谢谢你。”D项符合语境。A项为见面打招呼用语；B项在表示委婉拒绝时用；C项在表示非常感谢时用，均不符合句意。2C考查副词辨析。句意：也许，从现在起他真应该多锻炼。不管怎样，我希望他能很快恢复过来。somehow “由于某种原因”；somewhat “有
29、点；稍微”；anyway “不管怎样；无论如何”；anywhere “在任何地方”。故C符合题意。3Awatch over “照管”。句意为：我去游泳，你帮我看一下衣服好吗？其他选项均不符合句意。4B考查短语辨析。出了重大事故放长假，也就是说(换句话说)，他被开除了。前后句子从逻辑上讲不存在因果关系或者转折关系。5A考查动词的时态和语态。Italian Luca Parmitano 和select 是被动关系，故排除B，C。根据句意，表示过去的动作“已经被选入”对现在的影响，故用的是现在完成时的被动语态，故选A。6A考查交际用语。由答语中的not me可以看出，他不想去，所以选择A项，这是一句
30、美式俚语，意为“我不喜欢这个东西”或者“它不适合我”。7D考查词汇辨析。as作“随着”解为连词，引导时间状语从句。with 是介词，不能引导从句。8A考查时态、语态和主谓一致。答话人之所以让对方删除手机上要求汇款的信息是因为到目前为止已经有很多人上当受骗，所以用现在完成时的被动语态，排除C、D两项； many a表示“大量”，修饰单数可数名词，谓语动词用单数，故排除B项选A项。9C考查as a result的用法。as a result意为“因此，所以”，单独使用，表示后句是前句的结果；而however表示转折，moreover, furthermore表示递进，不符合语境。10D考查such
31、 aadj.nthat结构。注意，如果把A项中的a 放到wellknown后也是正确的。11C主要考查在交际用语中动词的时态及语态。根据主语与谓语动词的关系可知是被订购，于是排除选项A；选项B表示将要发生的事情；选项C表示已经发生的事情；选项D表示过去某个时候即将发生的事情。根据前面的Thats too bad.可知，事情已经发生，故答案为C。12B考查副词辨析。句意为：当一个人得到了物质财富后，他一定会寻求精神享受，这是一个被大家所普遍接受的真理。partly “不完全地，部分地”；universally “普遍地”；particularly “尤其，特别”；previously “先前，预
32、先”。语意表示这是被大家所普遍接受的真理，因此选B。13D考查交际用语。句意为：“恐怕我不能像计划得那么快完成任务。” “别急，慢慢来。”Im afraid为委婉的说法，不用Dont be afraid来回答；Dont mention it用来回答道歉；I suppose so表示“我想如此”，相当于I think so，不符合语境。Take your time表示“别着急，慢慢来”，符合句意。14D考查短语用法。deal with通常与how搭配；do with通常与what搭配。C项语序不对。15C考查时态。从句意知“过去十年来他一直都在发掘他最大的潜能”，另外，从“in the past
33、 decade”可知应该用现在完成时，同时此处强调十年来他一直保有的状态，所以用现在完成进行时，故选C。.A本文是一篇新闻报道，介绍了科学家的发现：树能为预防森林火灾的传感器供电。16C细节理解题。文章第三段提到的美国森林服务机构现在所采用的工具和方法花费高、分布少。如增加传感器，边远地区无法充电或换电池，故选C项。17C推理判断题。根据上下文可知此处为积少成多的含义。故答案C适合。A远水救不了近火；B海纳百川；D不雨则已，一雨倾盆。18D细节理解题。第四段中研究人员指出，一棵树产生不了多少能量，但随着时间的推移，细小的能量会不断增加，就像不断滴水的水龙头也能滴满一桶水一样，D项理解正确。19
34、B推理判断题。文章最后一段最后一句提到没人确切地知道树是怎么产生能量或人们如何利用这些能量，因而，下文会就此展开论述，故选B项。20A主旨大意题。文章第一段就点明主题：如何利用树所产生的能量预防森林火灾，A项概括了文章的主旨。B21C细节理解题。根据第三段第一句you never knew if you would be able to wake your computer without having to reboot it可知必须要重启电脑，故答案为C。22D细节理解题。根据文章第一段段首知提及C项，根据最后一段可知提及A、B两项，而D项在文中没有依据支持。23B细节理解题。文章第二段谈
35、到如果电脑有一段时间不用会自动转为休眠状态，这样耗电很少。最后一段最后一句说明电脑在处理不同的任务时，用电量也不同(复杂运算耗电最多)，故正确答案为B。 24A细节理解题。根据最后一段中The latter uses more energy because desktop power supplies are less efficient and require a separate and often larger，powerhungry monitor.可以推断A项是正确选项，而D项表述太绝对化。25B推理判断题。从第一段最后一句和第二段的第一句可以推断出电脑使用的寿命长短主要是如何正确使用电脑。C项是第二段第一句直接陈述的事实。