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    Two new studies suggest that modern running shoes could increase the risk of injuries to runners．

    One study involved sixty-eight healthy young women and men who ran at least twenty-four kilometers a week．The runners were observed on a treadmill machine．Sometimes they wore running shoes．Other times they ran barefoot．

    Researchers from the JKM Technologies Company in Virginia, the University of Virginia and the University of Colorado did the study．

    They found that running shoes create more stress that could damage knees, hips and ankle joints than running barefoot．They observed that the effect was even greater than the effect reported earlier for walking in high heels．

    The study appeared in the official scientific journal of the American Academy of Physical Medicine．

    The other study appeared in the journal Nature．It compared runners in the United States and Kenya．The researchers were from Harvard University in Massachusetts, Moi University in Kenya and the University of Glasgow in Scotland．

    They divided the runners into three groups．One group had always run shoeless．Another group had always run with shoes．And the third group had changed to shoeless running．

    Runners who wear shoes usually come down heel first．That puts great force on the back of the foot．But the study found that barefoot runners generally land on the front or middle of their foot．That way they ease into their landing and avoid striking their heel．

    Harvard’s Daniel Lieberman led the study．He says the way most running shoes are designed may explain why those who wear them land on their heels．The heel of the shoe is bigger and heavier than other parts of the shoe, so it would seem more likely to come down first．Also, the heel generally has thick material under it to soften landings．

    60．How many organizations are involved in the two studies?

           A．Three．    B．Four．     C．Five．      D．Six．

    61．What can we learn from the text?

           A．Most running shoes are designed improperly．

           B．The design of high heels is better than that of running shoes．

           C．No one will run with running shoes in the future．

           D．Both of the studies are done in America．

    62．Why do running shoes increase the risk of injuries to runners?

           A．They could create stress．

           B．They’re too big and heavy．

           C．They can affect the way the runners land．

           D．Their heels can soften landings．  

    63．How did the researchers do the two studies?

           A．By practising．              B．By comparing．     

           C．By questioning．            D．By reasoning．

    60—63 DACB  

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