1、课时跟踪练29 Unit 4 Global warming.阅读理解AA group of scientists are gathering today in the UK to discuss a thick piece of ice thats cracking in Antarctica，which is of the size of Delaware.The ice shelf is called Larsen C，and it now has a 90mile crack running through it.The big rift(裂缝)is slicing the ice sh
2、elf from top to bottom.But this is not just another sad climate change story.Its more complicated.“A lot of things are going on deep inside the ice，”says Adrian Luckman，a glaciologist.Luckman says climate change is certainly influencing this region.Larsen C used to have two neighbours to the north，L
3、arsen A and Larsen BAs the air and water warmed，those ice shelves started melting and then disappeared in 1995 and 2002.But the crack in Larsen C seems to have happened on its own，for different reasons.Larsen C has many cracks.All ice shelves do.This particular crack has been around since at least t
4、he 1960s.The unusual part is that in 2014，this crackand only this crackstarted growing quickly.Why?“Well，that is a little bit of a mystery and thats why it draws itself to our attention，”says Luckman.One puzzling aspect is how it managed to cut through areas of softer ice that bind(结合)the ice from n
5、eighbouring glaciers into one giant sheet.Starting in 2014，that soft ice did very little to slow down this rift.Scientists are split on how important this crack is for the stability of the whole ice shelf.Some say if this giant section breaks off，it wont make a difference.Others disagree.“Ice shelve
6、s are the gates of Antarctica in a way，and the gatekeepers of Antarctica.The ice shelves are already floating，so if they fall apart it does not immediately affect sea levels.Its what they hold backwater from all the inland glaciersthat could be problematic.If all the water packed in those glaciers m
7、ade their way to the sea，it could significantly raise global sea levels，”says Ala Khazendar，a geophysicist.1Larsen Cs two neighbours disappeared mainly because of Aclimate changeBhuman behaviourCthe crack in Larsen CDsome unknown reasons2Why is Larsen C special?AIt still exists.BIt has many cracks.C
8、One of its cracks is growing rapidly.DIt is getting bigger and bigger quickly.3Which one is true of soft ice?AIt is easy to cut through.BIts forming is still a mystery.CIt can prevent cracking to a degree.DIt exists mainly in small pieces of ice.4How does Ala Khazendar feel about the influence of th
9、e crack?AHe is very curious.BHe is unconcerned.CHe is pretty optimistic.DHe is cautiously worried.【语篇解读】一群科学家聚集在英国研究南极拉森C冰架继续崩裂的原因以及其对地球海平面的影响。1解析：细节理解题。根据文章第三段中的“As the air and water warmed，those ice shelves started melting and then disappeared in 1995 and 2002.”可知，空气和水的变暖，也就是气候的改变导致这些冰架开始融化继而逐渐消失，
10、故选A项。答案：A2解析：细节理解题。根据文章第四段“Larsen C has many cracks.All ice shelves do.This particular crack has been around since at least the 1960s.The unusual part is that in 2014，this crackand only this crackstarted growing quickly.”可知，拉森C冰架有很多裂缝，所有的冰架都如此。而这个特殊的裂缝至少从20世纪60年代就存在了。不同寻常的是，在2014年，这个裂缝，开始快速地增大，故选C项。
11、答案：C3解析：推理判断题。根据文章第五段最后一句“Starting in 2014，that soft ice did very little to slow down this rift.”可知，从2014年开始，那个软冰就很难减慢这个裂缝的增长速度了。由此可推测，在2014年之前，软冰在一定程度上阻止了崩裂，即“It can prevent cracking to a degree.”，故选C项。答案：C4解析：推理判断题。根据文章最后一段中的“The ice shelves are already.Its what they hold backwater from all the in
12、land glaciersthat could be problematic.If all the water packed in those glaciers made their way to the sea，it could significantly raise global sea levels.”可知，哈森达认为冰架已经在漂浮，但它们的分裂不会立刻影响海平面。而它们所阻挡的、来自内陆冰川的水才会带来问题。如果所有囤积在冰川中的水进入海洋，就会显著地升高全球的海平面。因此推测出他很担心裂缝的影响，故选D。答案：DBAt the age of seven，while his frien
13、ds were spending their allowances on things like candy and toys，Jose Adolfo Quisocola was busy saving money for basic purchases.To try to get his peers(同龄人)to do the same，the boy from Peru came up with the idea of an ecobank，the Bartselana Student Bank，which allows kids of all ages to become financi
14、ally independent while also helping the environment.Set up in 2012，the bank is the worlds first bank for kids.To become a member，a kid has to bring in at least 5 kilograms of solid waste and set a savings goal.Once accepted，all bank“partners”are required to deposit at least one additional kilogram o
15、f recyclables on a monthly basis and observe other requirements，such as attending financial education and environmental management workshops.The waste accumulated is sold to local recycling companies，who，thanks to Joses efforts，pay an abovemarket price for everything brought in by the bank members.T
16、he money received is placed in their personal accounts.When the savings goal is reached，the account holder can withdraw the money，or choose to leave it and continue to grow for a bigger target.“In the beginning，my teachers thought I was crazy or that a child could not undertake this type of project，
17、”Jose recalls.“They did not understand that we are not the future of the country but its present.Luckily，I had the support of the school headmaster and an assistant in my class.”The boys efforts paid off，and by 2013，the bank had over 200 members，who brought in one ton of recyclable waste.Today，the e
18、cobank，which now has the support of several local institutions，boasts 10 educational centres.They are designed to teach over 3，000 students，aged 10 to 18，to become financially independent，use their money wisely，and help the environment.Not surprisingly，Joses efforts have earned him several national
19、and international awards.On November 20，2018，Jose won Childrens Climate Prize，which comes with a medal and $5，500 in prize money and is given to a child or youth who has accomplished an extraordinary achievement for the climate or environment.5Why did Jose set up the bank?ATo raise money and set up
20、a recycling company.BTo buy necessities and donate them to needy kids.CTo save much money and protect the environment.DTo educate the students and help them win prizes.6How can a kid be admitted to the ecobank?ABy donating to the ecobank.BBy turning in one kilogram of waste in a month.CBy sending in
21、 an application.DBy presenting a goal and a certain amount of waste.7How did the teachers first feel about Joses programme?ADoubtful. BExcited.CMoved. DWorried.8What is Paragraph 4 mainly about?AHow the environment is improved.BWhat the project has achieved.CHow tons of waste has been recycled.DWhat
22、 support the local institutions get.【语篇解读】本文讲述了乔斯年少时通过创立一家环保银行，实现自己人生价值的励志故事。5解析：细节理解题。根据第一段中的“Jose Adolfo Quisocola was busy saving money for basic purchases.”以及“.the boy from Peru came up with the idea of an ecobank，the Bartselana Student Bank，which allows kids of all ages to become financially in
23、dependent while also helping the environment.”可知，乔斯设立环保银行的目的是存钱和保护环境。故选C项。答案：C6解析：细节理解题。根据第二段中的“To become a member，a kid has to bring in at least 5 kilograms of solid waste and set a savings goal.”可知，想要成为环保银行的会员，必须要带来至少5千克的固体废品并设定一个攒钱目标。故选D项。答案：D7解析：细节理解题。根据第三段中的“In the beginning，my teachers thought
24、 I was crazy or that a child could not undertake this type of project”可知，一开始老师对乔斯的项目持怀疑态度，故选A项。答案：A8解析：段落大意题。根据第四段首句中的“The boys efforts paid off”以及该段中给出的相关数据可知，该段主要介绍了环保银行这一项目所取得的成绩。故选B项。答案：B.七选五Electricity powers growth boosts education and improves lives.Yet about 1.1 billion mostly rural resident
25、s in Asia and Africa remain stuck in the dark.They have no electric light，rely on kerosene and diesel for power，and struggle to irrigate their crops. 1 But to realize the potential，governments need to rethink the role of utilities(公用事业) 2 Big grids(电网)make perfect sense for populous places.They can
26、cheaply supply power generated far away to millions and，as they incorporate more wind and solar energy，they are becoming greener.But in remote places，the economic case for grids becomes hard to make.Many utilities are short of cash，if not bankrupt. 3 China and Thailand took 20 years to improve elect
27、rification rates from about 30%40% to 85%90%.Reaching the remaining areas took a further 20 years；China managed it only in 2015.And universal electrification，a slogan beloved of politicians，is frequently less than it seems.In April，India celebrated the electrification of its last village，yet about 2
28、40 million people remain without power and connections are often unreliable.Entering minigrids，which can operate independently of national grids，is a way for private companies to offer services more quickly and reliably than frequently stateowned companies. 4 Unlike rooftop solar systems，which are i
29、ncreasingly common in parts of Africa but provide little juice，minigrids provide roundtheclock electricity capable of powering machinery，irrigation systems and freezers，as well as lighting. 5 In the interim(在此期间)，providers are using specialists in rural development and microfinance to teach people h
30、ow to set up businesses that benefit from a lot of power.They find that if people learn how to make money from electricity，they will willingly pay for it.AYet for that to happen，governments must embrace them.BMinigrids are banks of batteries often charged by solar arrays(太阳能电池阵)CTypically，countries
31、connect citizens with vast grid extension programmes.DThe cost of taking power to those least able to afford it adds to their debts.EMinigrids and rooftop solar systems can one day be hooked up to the main grid.FThe good news is that people can be connected to clean，reliable power faster than ever b
32、efore.GAlthough they are expensive，minigrids are likely to become cheaper as they grow more common.【语篇解读】电能为社会发展提供动力，为教育的繁荣起到了促进作用，同时还能提高人们的生活水平。但是在亚非国家大部分地处偏远的乡村，居民还没有使用上电，人们对电的渴求促使了政府重新考虑公用事业的作用。本文分别介绍了电力方面的两个公用事业：大型电网和微型电网。1解析：根据空后的“the potential”可知，F项(好消息是人们可以比以往更快地接触到清洁可靠的电力)即这种“可能性”。故选F项。答案：F2
33、解析：本段主要讲述了大型电网的运转情况。C项(通常国家把市民连入大型电网的扩建项目中)中的vast grid extension programmes与空后的Big grids相呼应，且C项与后文所表达的意义相符。故选C项。答案：C3解析：根据空前的“short of cash”可知，本段涉及经济问题。选项中涉及经济问题的只有D项，D项(把电输送到最负担不起电费的用户家里增加了他们的债务)符合语境。故选D项。答案：D4解析：空前讲的是微型电网的运行优势，故本空仍应讲微型电网的情况。B项(微型电网是一组电池，通常由太阳能电池阵充电)与上下文语义连贯，符合语境。故选B项。答案：B5解析：根据空后内
34、容可知，在此期间，用户一旦学会了用电赚钱，他们就会愿意买电。G项(虽然微型电网昂贵，但普遍推广后有可能会变得便宜)符合逻辑。故选G项。答案：G.语法填空There are many reasons 1. college and university students often fail 2. (get) a full nights of sleep.Many American students are away from their parents for the first time when they attend college.They might not be used to ha
35、ving total 3. (free) to plan their days and nights.Parties，latenight study meetings，or just time spent relaxing with friendsthese are all things that cut into college students sleep habits.A few years ago，Michael Scullin began teaching 4. science of sleep to psychology students at Baylor University
36、in Waco，Texas.Scullin is an assistant professor at Baylor and the director of its Sleep Neuroscience and Cognition Laboratory.He said his students seemed to enjoy the class and were interested in the material he was teaching.The class 5. (centre)around why the body needs to sleep and the physical an
37、d mental health problems 6. (cause) by lack of sleep.These include difficulty focusing on studies or 7. (control) ones emotions，and increased risk of many diseases.The United States，Centres for Disease Control and Prevention states that adults need at least seven hours sleep a night to stay 8. (heal
38、th)Scullin found students who slept more performed 9. (well)in two different classes，10. he published his findings in two academic publications last November.【语篇解读】文章介绍了大学生睡眠不足的问题，以及贝勒大学的助理教授的研究发现。1解析：考查定语从句。句意为：大学生经常睡不了整夜的觉有许多原因。本空考查定语从句，后面的从句成分完整且前面的先行词是reasons。故填why。答案：why2解析：考查非谓语动词。此处表示大学生睡不了整夜
39、的觉。fail to do sth为固定搭配，意为“未能做某事”。故填to get。答案：to get3解析：考查词性转换。句意为：他们可能不习惯完全自由地去计划自己的白天与晚上。形容词后应用名词，作having的宾语。故填freedom。答案：freedom4解析：考查冠词。句意为：几年前，迈克尔斯卡林开始教在得克萨斯州韦科市贝勒大学读心理学专业的学生睡眠科学。teach为及物动词，后可直接接宾语，空后是名词，此处应填冠词，具体科学前常用定冠词。故填the。答案：the5解析：考查动词的时态。句意为：该班级以研究人体为什么要睡觉和由于睡眠不足引起的身体与精神方面的健康问题为中心。根据时间状语
40、A few years ago可知，研究发生在几年前，故此处应用一般过去时。故填centred。答案：centred6解析：考查非谓语动词。句意见上一题解析。problems与cause之间为逻辑上的被动关系，此处应用cause的过去分词作problems的后置定语。故填caused。答案：caused7解析：考查非谓语动词。句意为：这些(身心问题)包括专心学习和控制情绪方面的困难以及增加的(患上)许多疾病的风险。(have)difficulty(in)doing sth为固定用法，意为“做某事有困难”，且设空处与前面的focusing并列，形式应保持一致。故填controlling。答案：controlling8解析：考查词性转换。此处表示成年人每晚需要至少七小时的睡眠来保持健康。stay healthy为固定搭配，意为“保持健康”。故填healthy。答案：healthy9解析：考查副词的比较级。句意为：斯卡林在两个不同的班级里发现睡得更多的同学表现得更好，并且他于去年十一月把他的发现发表在了两本学术刊物上。根据空前的more可知，此处应用比较级。故填better。答案：better10解析：考查连词。句意见上一题解析。由句意可知，两个分句之间是并列关系，应用并列连词。故填and。答案：and