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    Electric bicycles which run on battery-operated (电瓶) motors are winning over riders of ordinary bikes   41 their speed, quality and environmental advantage.
    They were first   42 on 1980s in China, but the selling was not very good. Today, thanks 43  improvements on battery quality, the electric bikes sell well. There are now more than 100 electric bicycle producers in China and 26 million such bicycles were produced in 2011. Japan is another large  44  of such bicycles in the world with a total production reaching 381,721in 2010.
      45 China is one of the largest producers of electric bicycles in the world, the   46  of its producers with mass production (大批量生产) is actually small.
    Electric bicycles are still   47 in China. Time is needed for people to become familiar with them and accept them. Each bike’s price of between 2,000 yuan (US $318) and 3,000 yuan (US $477) is still  48  for ordinary citizens (民众). Although such bikes are quick, safe and 49 to operate, their batteries still have shortcomings (不足). They weigh more than 10 kilograms; their service life is   50  two years and they   51  400 yuan each.
    There were more than 450 million bikes in China in 2006. If just one percent of all these bikes are replaced by electric  52  , the market will be very large. And   53  the battery is further improved and the price is    54   , many of us will not be able to keep back from    55  the latest electric bikes

    【小题1】
    A．because ofB．becauseC．towardsD．at
    【小题2】
    A．buildB．builtC．buildingD．to build
    【小题3】
    A．forB．inC．byD．to
    【小题4】
    A．producerB．productionC．produceD．to produce
    【小题5】
    A．ButB．IfC．AlthoughD．When
    【小题6】
    A．buyerB．numberC．priceD．owner
    【小题7】
    A．oldB．tallC．newD．short
    【小题8】
    A．smallB．largeC．expensiveD．high
    【小题9】
    A．easyB．difficultC．hardD．easily
    【小题10】
    A．other thanB．more thanC．overD．less than
    【小题11】
    A．spendB．costC．takeD．make
    【小题12】
    A．carsB．bikeC．onesD．one
    【小题13】
    A．whereB．unlessC．whetherD．if
    【小题14】
    A．increasedB．raisedC．reducedD．lifted
    【小题15】
    A．buyingB．broughtC．to buyD．buy


    【小题1】A
    【小题2】B
    【小题3】D
    【小题4】A
    【小题5】C
    【小题6】B
    【小题7】C
    【小题8】D
    【小题9】A
    【小题10】D
    【小题11】B
    【小题12】C
    【小题13】D
    【小题14】C
    【小题15】A

    解析【小题1】根据前后文的关系可知答案为A，表示 由于的意思，在此符合题意。
    【小题2】本题考查的是一般现在时的被动语态，故选B因为只有B为被动语态。
    【小题3】thanks to 表示多亏了，符合句子意思，故选D
    【小题4】只有答案A，符合题意，表示日本也有生产厂家，故选A
    【小题5】根据上下文的联系，可知答案为C，表示尽管的意思。
    【小题6】根据上下文的内容可知答案为B
    【小题7】根据下文的内容可知答案为C
    【小题8】价格高，用high，故选D
    【小题9】根据although，可知答案为A，表示比较容容易，故选A
    【小题10】根据their batteries still have shortcomings (不足)可知答案为D
    【小题11】主语为物，表示花费为cost，故选B
    【小题12】根据上下文内容可知答案为C，表示代替上文的电瓶车，故选C
    【小题13】根据下文内容可知答案为D，表示假设的意思。
    【小题14】be+动词的过去分词，表示被动语态，故选C
    【小题15】from为介词，其后接动词ing 形式，故选A

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