Tahira Reid and other researchers at Purdue University are studying how heat treatment interacts with different types of hair and how to prevent damage. Amy Marconnet is an assistant professor. She says the team is seeing how heat and temperature relate to their research.

　　In a Purdue University's lab, team members designed a hair straightener tool - a flat iron with temperature control. They attached it to a robotic arm that moved over pieces of hair. They controlled the temperature while the device straightened hair.

　　What did they find? Their study found that the heat weakens or breaks a protein called keratin, responsible for the hair's shape, and temporarily changes it. But nobody knows exactly what level can make the heat actually cause forever damage.

　　Researchers say early results are a bit inconclusive. It turns out that everyone's hair is different and that there's no exact temperature where hair straightening becomes hair damage. Ms Reid says they will continue their research in the hope of finding what works best without damaging the hair.

　　语篇解读：有的人喜欢将卷发弄直，有的人则喜欢将直发弄卷，这种行为会伤害头发吗？

　　5．What does the scientist want to find out?

　　A．Ways to protect our hair.

　　B．Ways to protect eyebrows.

　　C．The temperature that makes hair curly.

　　D．The temperature that can damage hair.

　　解析：选D　推理判断题。根据第一段的"A scientist from Purdue University ... when it comes to your hair."以及末段的"... there's no exact temperature where hair straightening becomes hair damage."可知，这个研究是为了找出什么温度会对头发造成损害。

　　6．The underlined part "those people" in Paragraph 2 refers to those who ________.

　　A．are African­American

　　B．love their hair very much

　　C．love making their hair look curly

　　D．aren't easily satisfied with their hairstyle

　　解析：选D　推理判断题。根据画线词前面的"Some people who have ... want to have curls."可知，这些人对他们的头发比较挑剔，故选D项。

　　7．What do we know about the hair straightener tool?

　　A．It is controlled by a robot.

B．Its temperature can be changed.