[答案]　B

　　4．What might be the best title for the text?

　　A. How to Save Rainforests

　　B. How to Protect Nature

　　C. Rainforests and the Environment

　　D. Rainforests and Medical Development

　　[解析]　主旨大意题。整篇文章主要论述了热带雨林的重要作用以及砍伐热带雨林对环境所造成的影响。

　　[答案]　C

　　****************************************************************结束

　　A

　　To complete a study, a team of scientists left Boston and went halfway around the world to the middle of Kenya．They wanted to find out more about barefoot running．

　　Sure, people can run barefoot anywhere．But Kenya has produced some of the most famous long-distance runners in history, and many of these athletes grew up not wearing shoes．Scientist Daniel Lieberman visited some of these runners to figure out what a difference shoes make．

　　It was a big difference, and not necessarily for the better．In particular, when a bare foot hits the ground, the blow（冲击） is softer and the running motion is smoother．Running barefoot may have advantages over running with shoes on, though more studies are needed to determine whether or not barefoot running reduces the chance of injures．

　　One shouldn't be scared of barefoot running or think it strange, Lieberman told Science News． It's normal and, if done properly, it is very fun and comfortable．

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