题目内容：

Some people are great at remembering faces. Once they meet you, they never forget how you look. For some people, remembering a face can be difficult. You may have to meet them several times before they can recognize you. For others, remembering a face is simply impossible. Such people have a condition of the brain called “face blindness.” Its actual name is developmental prosopagnosia, or DP for short.

Experts say there are great differences between patients. In less severe conditions, people are unable to describe the face of someone they have just met. In severe conditions, people cannot even recognize their own kids in a group photograph.

Many people who have DP show no clear signs. Dacia Reid is one of them. If you met her, you probably would not know that her brain got injured as a child. There would be no sign of it until you meet her a second time. She would not remember how you looked. Reid has mostly got well from her injuries. But now, she suffers from face blindness.

The latest study on face blindness come from the Prosopagnosia Research Centers at Dartmouth College in the United States. The researchers studied how people recognize faces. They compared 22 patients with DP to 25 other people. The researchers showed them videos of faces, bodies, physical objects and other things. They found that people with DP may not have been able to remember faces, but they could recognize scenes, bodies and other things.

The researchers say this study on face blindness will not directly lead to any treatments. However, it could lead to a deeper understanding of how we all remember the world around us. “We hope that by really developing and understanding face processing itself — that will provide us with a model for understanding how other parts of the brain work.”

1.The underlined word “severe” in Paragraph 2 probably means “       ”.

A.important B.serious C.popular D.different

2.The writer explains the underlined sentence in paragraph 3 by _______.

A.making a research B.having a discussion

C.giving an example D.doing an experiment

3.From the passage we know patients with DP _______.

A.can easily keep everything in memory

B.have trouble in remembering faces

C.are unable to remember anything they’ve seen

D.never forget how you look once they meet you

4.The writer wrote this passage in order to ________.

A.introduce DP and the research about it

B.describe how to avoid suffering from DP

C.encourage people to help patients with DP

D.explain why people suffer from face blindness