But this new progress is divergent: The skin is already fully functional on its own, producing everything from hair to sweat, just like normal skin does. That means it’s rapidly speeding up the healing process. But lab-grown skin doesn’t just cause major breakthroughs for burn treatments. Lab-grown, fully functional skin could have another value to the world: getting rid of animal testing. Because fully functioning samples of human cells would be more effective for testing of those products than animal friends.

　　Of course both grafting and testing advances are still a few steps down the road. While mice responded well to these skin samples, the technology needs to be adapted for human use. Scientists estimate(估计) they’re 5 to 10 years from actually being able to successfully replicate(复制) the process with human skin.

　　1. The functions of healthy skin include ____.

　　① Preventing infections.

　　② Speeding up the healing progress.

　　③ Producing vitamins.

　　④ Adjusting body temperature.

　　A. ①②④

　　B. ②③④

　　C. ①③④

　　D. ①②③

　　2. What does the underlined word “divergent” mean?

　　A. Creative.

　　B. Different.

　　C. Valuable.

　　D. Helpful.

　　3. What can we know about lab-grown fully functional skin?

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