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    12．President Barack Obama rode a bicycle at the White House Science Fair on April 22．But it wasn't an ordinary bike．As he pedaled，the President stayed in place，while the energy from his pedaling powered a water filtration （过滤） system．He was testing an invention created by a team of 14students from Northeast High School，in Oakland Park，Florida．
    Payton Karr，16，and Kiona Elliot，18，attended the fair as representatives of the project．"We were hoping President Obama would ride the bike，but we didn't actually expect him to，"Payton told TFK．"It really meant a lot．"Kiona agreed．"It was pretty awesome to see the invention，which was invented by a group of 14high school students and one teacher，along with the help of community members，got the interest of the leader of our nation，"she said．
    The project was an idea that came about after one of the Northeast students，Kalie Hoke，visited Haiti after the terrible 2010earthquake and saw how difficult it was to find clean water．The students invented a portable（便携的），bicycle-powered emergency water filtration system，which can provide 20-30people with drinking water in a 15-hour period．The teens hope their invention will one day be used by relief organizations like the Red Cross．"They can take it to places after natural disasters so that water can be clean for the people there，"said Payton．
    Payton and Kiona were among the 100students from more than 40states invited to the third annual White House Science Fair，in Washington，D．C．，which is also attended by leaders in science and education．President Obama started the event in 2010to  stimulate  students interested in STEM （Science，Technology，Engineering，Maths）．"Well，if you're a young person and you produce the best experiment or design，you ought to be recognized for that achievement，"Obama said when he first announced the fair．
    President Obama praised the projects during a speech to attendees after the fair．"The science fair projects of today could become the products and businesses of tomorrow，"he said．"If you're inventing things in the third grade，what are you going to do by the time you get to college？"

    36．What is special about the bicycle President Obama rode？C
    A．It can move very fast．
    B．It is extremely beautiful．
    C．It is used to make water clean．
    D．It is made of eco-friendly materials．
    37．The representatives of the bicycle-powered water filtration systemD．
    A．were both community members
    B．graduated from a famous university
    C．finished the project with the help of their parents
    D．were surprised that their invention interested Obama
    38．The bicycle-powered water filtration system was designedD．
    A．at the request of the Red Cross
    B．for city families to get pure water
    C．during the terrible 2010earthquake in Haiti
    D．to provide people in disaster areas with clean water
    39．The underlined word"stimulate"in Paragraph 4can be replaced byB．
    A．help       B．inspire        C．change        D．entertain
    40．We can know from the last sentence in the passage that President ObamaD．
    A．wanted the youth to have big dreams
    B．encouraged the youth to go to college
    C．worried the young inventors would do nothing in college
    D．believed the young inventors would have a promising future．

    分析 奥巴马总统在白宫试验了一种以骑自行车为动力的水源净化装置，而该装置的发明人竟是还在上学的一群孩子．在经历了2010年的一场地震后，他们想要像红十字会一样帮助别人，于是设计发明了这个装置．

    解答 36．C 细节理解题．由"As hepedaled，the President stayed in place，while the energy from his pedalingpowered a water filtration （过滤） system．（总统亲自蹬自行车试验通过蹬自行车产生的能量可以用来给过滤水的系统充电．）"可知，该装置是用来净化水的． 故选C．
    37．D 细节理解题．由""It waspretty awesome to see the invention，which was invented by a group of 14 highschool students and one teacher，along with the help of community members，gotthe interest of the leader of our nation，"she said．"可知，当他们获知自己代表小组去白宫时感到很吃惊．故选D．
    38．D 细节理解题．由"They cantake it to places after natural disasters so that water can be clean for thepeople there"可知该装置的目的是为了给灾区的人提供洁净的水．故选D．
    39．B 词义猜测题．help帮助；inspire鼓励；change改变；entertain娱乐．由文章可知奥巴马总统是在鼓励同学们．故选B．
    40．D 推理判断题．奥巴马总统认为人们的一点小的发明创意也许就会变成大产业，所以他相信年轻的创业者会有美好的前途．故选D．

    点评 本文是新闻报道类阅读，主要考查细节理解题和推理判断题．在做细节理解题时，首先根据题目要求迅速在文章里找出相应的段落、句子或短语．认真比较选项和文中细节的区别，在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．

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