练习册

  • 练习册
  • 试题
    精英家教网 > 高中英语 > 题目详情

    Lead deposits, which accumulated in soil and snow during the 1960’s and 70’s, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.

    A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining.

    In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Canadian gasolines and thus enabled scientists to differentiate (区分) the lead sources. The dominant lead ratio found in Greenland snow matched that found in gasoline from the United States.

    In a study published in the journal Ambio, scientists found that lead levels in soil in the Northeastern United States had decreased markedly since the introduction of unleaded gasoline.

    Many scientists had believed that the lead would stay in soil and snow for a longer period.

    The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990. The forest environment processed and redistributed the lead faster than the scientists had expected.

    Scientists say both studies demonstrate that certain parts of the ecosystem (生态系统) respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.

    69.   The study published in the journal Nature indicates that ________.

    A.    the Clean Air Act has not produced the desired results

    B.    lead deposits in arctic snow are on the increase

    C.    lead will stay in soil and snow longer than expected

    D.    the US is the major source of lead pollution in arctic snow

    70.   Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US   _____ .

    　A.    was discouraged                  B.    was enforced by law

    C.    was prohibited by law           D.    was introduced

    71.   How did scientists discover the source of lead pollution in Greenland?

    A.    By analyzing the data published in journals like Nature and Ambio.

    B.    By observing the lead accumulations in different parts of the arctic area..

    C.    By studying the chemical elements of soil and snow in Northeastern America.

    D.    By comparing the chemical compositions of leaded gasoline used in various          countries.

    72.   The authors of the Ambio study have found that ________.

    A.    forests get rid of lead pollution faster than expected

    B.    lead accumulations in forests are more difficult to deal with

    C.    lead deposits are widely distributed in the forests of the US

    D.    the upper layers of soil in forests are easily polluted by lead emissions

       

     69-72.

    练习册系列答案
    年级 高中课程 年级 初中课程
    高一 高一免费课程推荐！ 初一 初一免费课程推荐！
    高二 高二免费课程推荐！ 初二 初二免费课程推荐！
    高三 高三免费课程推荐！ 初三 初三免费课程推荐！
    相关习题

    科目：高中英语 来源： 题型：054

    完形填空:　　 选出一个最 佳答案。

    　　

        Not long ago, there lived in Auckland a working family who dreamed about a house of their own. 1 then could read in the newspapers about the building companies(公司) who offered 2 people into a new house 3　　 only a $ 1, 000 deposit (定金). Of course, the remainder (余款) had to 4 with interest (利息) over a period of twenty years or so.

    　　

        The worker and his wife hopefully went to one of these companies 5 this wonderful offer. And the man in the office said." Yes, sure. You 6 along $ 1,000 and we can 　　 7 you with a new house."

    　　

        So the worker and his wife 　　 8 to work hard and in twelve months' time they returned to the building man with $ 1, 000. But the man in the office said, "Look, I'm sorry, 9 we'll need $ 1, 500 now. 10 have gone up since we saw you last, you know."

    　　

        The couple thought 11 and decided it would 12 very long to save the extra $ 500 if they worked hard.

    　　

        In six months they worked 13 overtime and saved the $ 500 14 the high rent they had to pay for their flat. Back to the building man they 15 with their $ 1, 500. But 16 their surprise he 17 the deposit was now $ 3, 000.

    　　

        Now somewhat wiser, the worker said," And the next time, I dare say we'll find the deposit 18 once more. How have we 19 save the extra $ 1, 500?"

    　　

        "Well,"said the man. "I think we can sterilize (稳定)the 20　　 for about twelve months. By the time you come with $ 3,000, we will have had the house 21 for you."

        The couple left, sad at 22 as they saw their dream house 23. By the time they had saved the extra $ 1, 500, 24 the deposit would have become 25, maybe $ 5, 000, then $ 10,000 and then…!

    (1) A. Anyone　　　　　　B. Someone     C. No one　　　　　　D. Every one　　　　　　　　　　   ［　　］ (2) A. to lead　　　　   B. to spend    C. to pay　　　　　　D. to put　　　　　　　　　　　　  ［　　］ (3) A. for　　　　　　   B. with    C. on　　　　　　　　D. to　　　　　　　　　　　　　　  ［　　］ (4) A. pay off　　　　   B. be paid off    C. pay for　　　　   D. be paid about　　　　　　　　   ［　　］ (5) A. to ask for　　　　B. asking for    C. to ask about　　  D. asking about　　　　　　　　    ［　　］ (6) A. come　　　　　　  B. get    C. take　　　　　　  D. bring　　　　　　　　　　　　   ［　　］ (7) A. supply　　　　　　B. give    C. offer　　　　　　 D. equip　　　　　　　　　　　　   ［　　］ (8) A. ought　　　　　　 B. used    C. had　　　　　　   D. stuck　　　　　　　　　　　　   ［　　］ (9) A. or　　　　　　　　B. and    C. but　　　　　　   D. so　　　　　　　　　　　　　　  ［　　］ (10) A.Dollars　　　　   B. Costs 　　C. Interests　　　　D. Pays　　　　　　　　　　　　　　［　　］ (11) A. over it　　　　  B. it over 　　C. it about　　　　 D. again　　　　　　　　　　　　   ［　　］ (12) A. take　　　　　　 B. not take 　　C. spend　　　　　　D. not spend　　　　　　　　　　   ［　　］ (13) A. whole the　　　　B. whole 　　C. the all　　　　  D. all the　　　　　　　　　　　　 ［　　］ (14) A. in spite of　　  B. instead of 　　C. because of　　   D. in need of　　　　　　　　　　  ［　　］ (15) A. filled　　　　   B. dealt 　　C. went　　　　　　 D. went on　　　　　　　　　　　　 ［　　］ (16) A. from　　　　　　 B. to 　　C. with　　　　　　 D. without　　　　　　　　　　　　 ［　　］ (17) A. replied　　　　  B. announced 　　C. told　　　　　　 D. spoke　　　　　　　　　　　　   ［　　］ (18) A. raised　　　　   B. raising 　　C. risen　　　　　　D. rising　　　　　　　　　　　　  ［　　］ (19) A. had to　　　　   B. worked to 　　C. tried to　　　　 D. got to　　　　　　　　　　　　  ［　　］ (20) A. situation　　　　B. money 　　C. house　　　　　　D. salary　　　　　　　　　　　　  ［　　］ (21) A. sold　　　　　　 B. paid 　　C. prepare　　　　  D. ready　　　　　　　　　　　　   ［　　］ (22) A. heart　　　　　　B. mind 　　C. hearts　　　　   D. minds　　　　　　　　　　　　   ［　　］ (23) A. throw away　　   B. die away 　　C. take away　　　　D. get away　　　　　　　　　　　　［　　］ (24) A. no doubt　　　　 B. no wonder 　　C. no matter　　　　D. no longer　　　　　　　　　　   ［　　］ (25) A. the most　　　　 B. the lowest 　　C. still higher　　 D. even larger　　　　　　　　　　 ［　　］

    查看答案和解析>>

    科目：高中英语 来源：2010年高考二轮复习完形填空模拟训练 题型：完型填空


    原创（四）
    It is universally known that friendship is one of the permanent themes in the literature of all languages. Friends are people who willingly and readily help us when we are in trouble, and show   36  for us when we are in misery. This is   37   human beings were born to need the warmth and laughter of friends. Some of us like    38  friends, while others different friends. Personally,I prefer both.
    It goes without saying that having similar friends has many    39  , We can feel a renewed sense of    40  when we have a group of old friends who would    41    our sufferings and happiness.   42  ,  old friends always  know  how to   43  mutual trust（互信）and how to avoid    44   conflicts. I always feel    45   when I meet an old friend after a long   46  . Immediately, hearty laughter    47   the atmosphere.
    Nevertheless I believe that a mixture of friends is    48  advantageous. One can ___49___ various sorts of friends in three aspects. First, frequent    50   with different friends broadens my world   51   ．Just as various kinds of nutriments keep you healthy, making a   52   of friends keeps you lively. Secondly , I have found that the   53  friends cannot only    54  new adventures but alse show me new   55  to success in life. Thirdly, they can help me with whatever difficulties I encounter in life.
    To conclude, I prefer to have both types of friends and as many as possible. Of course, I will not forget friends wisely.
    36．A．direction         B．respect                    C．sympathy         D．anxiety
    37．A．because          B．why                       C．how                D．What
    38．A．true                B．right                       C．same               D．similar
    39．A．problems        B．advantages             C．disadvantages   D．duties
    40．A．tension           B．challenge                C．strength          D．oppression
    41．A．share             B．convey                   C．guarantee         D．cause
    42．A．Therefore       B．Otherwise               C．However          D．Moreover
    43．A．lack               B．abandon                  C．bear                D．maintain
    44．A．obvious          B．impossible                 C．impressive              D．hidden
    45．A．stressed          B．worried                  C．delighted         D．confused
    46．A．experience      B．departure                C．work               D．discussion
    47．A．fills               B．weakens                  C．ruins               D．buries
    48．A．eagerly           B．equally                  C．bitterly            D．rarely
    49．A．make with             B．benefit from            C．result from       D．appeal to
    50．A．quarrel           B．contact                   C．argument               D．view
    51．A．attitude           B．position                  C．outlook         D．ambition
    52．A．range                     B．series                      C．quantity           D．variety
    53．A．strange           B．doubtful                 C．available          D．different
    54．A．result from     B．stick to                   C．attend to          D．lead to
    55．A．avenues         B．appeal                    C．benefit             D．attitude

    查看答案和解析>>

    科目：高中英语 来源：2013届湖南省怀化市高三上学期期末考试英语试卷（带解析） 题型：完型填空

    It was the second day of a winter holiday in Queenstown, New Zealand, three years ago. When we decided to explore the beautiful scenery, our landlady   36  us,“Make sure you are well wrapped up today. The weather is   37 . Head back when you see snowfall.”
    The day was bright and sunny, and I started to wonder if she was being too cautious. When snow began to fall at 6:00 pm, I was not worried, thinking we’d have no   38  in catching a taxi back. However, we waited for a while, and all the drivers shook their heads when told of our   39 .
    The first driver passed by and gave me a card with a number for me to   40  help. I was filled with   41  , but I had no choice but to lead my three sisters to a nearby place to make the   42 . Then a taxi drew up and we climbed in. The driver did not appear very friendly. Then the light streaming from his headlights showed very   43  why no taxi wanted to take us to our hotel. And I began to understand the driver’s apparently unfriendly silence — he was worried. The steep incline (斜坡) ahead was   44  with snow. The taxi slowly made its way up the hill. Suddenly, we came to a dead stop, and the driver turned to us. “Look! It is very    45  to go forward. You have to get out and walk. If I drive any further, the taxi will slide back,” he said. “Er ... can you keep your headlight on and help my elder sister? The rest of us will follow you up,” I said. The driver   46 .
    We made it safely back to our hotel. Even though it   47   for the rest of the days, we could see the silver lining in the cloud(一线希望): the generous soul who helped us.

    【小题1】
    A．protectedB．guardedC．helpedD．warned
    【小题2】
    A．hatefulB．colorfulC．changeableD．unforgettable
    【小题3】
    A．reasonB．timeC．trouble D．opportunity
    【小题4】
    A．situationB．destinationC．backgroundD．information
    【小题5】
    A．call forB．wait forC．give upD．look up
    【小题6】
    A．confidenceB．prideC．doubtD．joy
    【小题7】
    A．appointmentB．callC．way D．invitation
    【小题8】
    A．clearlyB．weaklyC．UnwillinglyD．quietly
    【小题9】
    A．chargedB．coveredC．crowdedD．provided
    【小题10】
    A．dangerous B．possibleC．limitedD．unacceptable
    【小题11】
    A．agreedB．admittedC．admiredD．applied
    【小题12】
    A．shoneB．blewC．rained D．snowed

    查看答案和解析>>

    科目：高中英语 来源：2010年江苏盐城中学高二下学期期末考试英语卷 题型：阅读理解

    Justin’s bedroom was so full of flat bicycle tires, bent tennis rackets, deflated（瘪掉的）basketballs, and games with missing pieces that you could barely get in the door. His parents pleaded with him to clean out his room.
    “What use is a fish tank with a hole in the bottom?” his father asked. But Justin simply smiled and repeated his motto, “Never throw anything out, you never know when it might come in handy.”
    When Justin was away from home, he always carried his blue backpack--a smaller version of his bedroom--a place to store the many objects that he collected. It was so worn and stretched that it hardly resembled a backpack anymore.
    Justin had earned a reputation for figuring things out and getting people out of otherwise hopeless situations. Many of his classmates and neighbors sought him out when they needed help with a problem. On the first day of school, his friend Kenny, came looking for Justin.
    “Do you think you have something in your bag that could help me remember my locker combination?” he asked. “I lost the piece of paper it was written on. I have a science class in two minutes and if I’m late on the first day it’ll make me look bad for the rest of the year.” Kenny looked really worried.
    “Relax,” Justin said, taking his backpack off and unzipping the top. “Remember how you borrowed my notebook in homeroom to write the combination down? Well, I know how we can recover what you wrote.”
    He took the notebook and a soft lead pencil out of his bag. The page that Kenny had written on had left faint marks on another page in the notebook. Justin held the pencil on its side and rubbed it lightly over the marks. Slowly but surely the numbers of the locker combination appeared in white, set off by the gray pencil rubbings.
    “That’s amazing!” Kenny said. “I owe you one.” And he dashed off to open his locker.
    It was just another day in the life of the boy whose motto was “Never throw anything out, you never know when it might come in handy.”
    【小题1】Why is Justin’s room such a mess? WWW.K**S*858$$U.COM

    A．He always forgets to clean it.B．He shares the room with his brother.
    C．He has no time to clean it.D．He never throws anything away.
    【小题2】In what way is Justin’s backpack a smaller version of his bedroom?
    A．He uses it as a place to store objects.
    B．He uses it to carry his books and sports equipment.
    C．His parents tell him to clean it all the time.
    D．He’s had it for as long as he can remember.
    【小题3】The underlined phrase "pleaded with" means
    A．ignoredB．askedC．pushedD．Ordered
    【小题4】How does Kenny feel toward Justin?
    A．Annoyed.B．Disinterested.C．Grateful.D．Angry.

    查看答案和解析>>

    科目：高中英语 来源：江苏期中题 题型：阅读理解

    阅读理解。
         Online shopping can help one buy a book, a T-shirt, or a cell phone. Now, even cars
    can be purchased on the Internet with just a few clicks of a mouse.
         China's privately owned Zhejiang Geely Holding Group Co, which acquired the
    Swedish carmaker Volvo Car Corporation from Ford Motor Company earlier this year,
    on Monday launched (推出)its official store on Taobao Mall. The venture, on China's
    largest business-to-customer shopping site by market share, means Geely is the first
    automaker to sell cars on Taobao.
         The company will begin offering two of its Panda models on the website from Dec
    22, initially (最初)through a group-buying system. "We will add more cars to the Geely
    store in the future, and also sell special editions(版本)which are only available on the
    Internet," said Liu Jinliang, vice-president of Geely, adding that the special editions will
    help differentiate(区分)the products sold in 4S (sales, service, spare parts and survey)
    stores and those on the company's online store.
         Customers can search for information, place orders, and pay their deposit(保证金)
    through the company's online store, and then test-drive, obtain their cars, and pay the
    remainder of the purchase price at traditional 4S stores. Liu said the company will provide
    door-to-door delivery (交货), an installment payment(分期付款)plan, and pay-in-full
    services in the future, as it aims to improve the overall quality of online shopping.
         Selling cars online is seen not only as a means of attracting attention, but also as a way
    of cutting costs. "By setting up an online store, we can save costs originally incurred (引起)
    for land, infrastructure (基础设施), and human resources," said Yang Xueliang, public
    relations director of Geely, adding that the company may consider lowering the number
    of its physical stores(实体店)if the online venture is successful. "The costs saved, in turn,
    will lead to discounts for customers," Yang added.
         Though online stores will not replace the functions of 4S stores, they are a phenomenon
    many automakers may adopt in the future, said analysts.
         "It (setting up an online store) helps automakers to explore new ways of selling, though
    it is far from a large-scale practice," said Jia Xinguang, a senior auto industry analyst.
    1. The purpose of the passage is to tell us _______________________.             .
    A. Online auto stores will replace the functions of 4S stores.
    B. Geely is the first automaker to sell cars on Taobao.
    C. Now cars can be purchased on the Internet.
    D. Selling cars online is a means of attracting attention.
    2. According to Liu Jinliang, _______________________.             .
    A. the cars sold online will be cheaper    
    B. more cars have been added to the Geely store
    C. the cars sold in 4S stores and those on the company's online store are just the same
    D. there'll be special car editions which are only available on the Internet
    3. It can be implied from the passage that _____________________.
    A. the company offers two of its Panda models on the website
    B. the company will provide door-to-door delivery service
    C. customers must pay all the money through the online store
    D. selling cars online can save money for customers
    4. What's the analysts' attitudes towards online auto stores?
    A. It will never replace the functions of 4S stores.    
    B. It's a new way of selling cars.
    C. More automakers may adopt it in the future.      
    D. It is a large-scale practice.

    查看答案和解析>>

    同步练习册答案