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.

　　But the researchers do not suggest that runners immediately start running barefoot.

　　They say it takes some training.

　　And there can be risks,

　　like running when your feet are too cold to feel if you get injured.

　　The study was partly supported by Vibram, which makes a kind of footwear that it says is like running barefoot. The findings have gotten a lot of attention. But the researchers say there are many problems in the way the press has reported in their paper. So they have tried to explain their findings on a Harvard website.

　　4. What's the main idea of the passage?

　　A. Walking in high heels could have fewer serious effects than running barefoot.

　　B. Two new discoveries encourage people to run in high heels.

　　C. Running in shoes is partly good to runners.

　　D.

　　Two new studies prove running without shoes is beneficial to runners in most cases.

　　5. Which part of our body could be injured if we run in running shoes?

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