题目内容：

    Heat has been used to control hair for hundreds of years. But how much is too much? If you have ever opened a very hot oven, you know that heat can burn your eyebrows off your face very quickly. A scientist from Purdue University in Indiana is trying to find a scientific answer on how hot is too hot when it comes to your hair.

Many women and some men are very particular about their hair. Some people who have naturally curly hair prefer to have it straightened. Others with straight hair want to have curls. Tahira Reid is one of those people. As an African-American woman, she is familiar with the challenges of maintaining (保养) curly hair.

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 change. Researchers say early results are a bit inconclusive.

It turns out that everyone’s hair is different and 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 hair.

1.What does the scientist want to find out?

A. Ways to protect our hair.

B. Ways to maintain curly hair.

C. The temperature that can damage hair.

D. The temperature that makes hair curly.

2.The underlined part “those people” in Paragraph 2 refers to those who ________.

A. are African-Americans

B. love their hair very much

C. love making their hair curly

D. love changing their hairstyle

3.When the heat breaks a protein called keratin in the hair, ________.

A. the hair gets burned

B. the hair’s shape is changed

C. the hair is forever damaged

D. the hair surely becomes curly.