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    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 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 respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.

    57.　 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

    58.　 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

    59.　 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.

    60.　 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

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    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　　　　　　　　　　 ［　　］

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    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）
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    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
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    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
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    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.”
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    【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

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    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

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    阅读理解。
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    C. Now cars can be purchased on the Internet.
    D. Selling cars online is a means of attracting attention.
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    3. It can be implied from the passage that _____________________.
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    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
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    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.

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