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

　　A．Walking in high heels could cause less 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 less risky to runners in most cases.

　　答案：D　主旨大意题。第一段“Two new studies suggest that modern runing shoes could increase the risk of injuries to runners。”点出了文章的主题：穿跑鞋跑步会增加受伤的风险。在下文的试验中多次提到赤脚跑步的损伤较小。由此可推断本文的主旨大意是赤脚跑步对运动员来说风险较小。故选D项。

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

　　A．Toes.B．Hips.

　　C．Feet. D．Legs.

　　答案：B　细节理解题。根据第四段第一句“They found that running shoes create more stress that could damage knees，hips and ankle joints than running barefoot.”可知，应选B项。

　　23．What can we learn from the passage?

　　A．The way that we run by landing on the front or middle of our foot could avoid damaging our heel.

　　B．We should start running barefoot in no time.

　　C．Running in modern running shoes could cause more serious effects than running in high heels.

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