《2025年分层导学案九年级英语全一册沪教版》

Ⅲ 阅读理解
语篇类型：说明文 主题：人与社会(有突出贡献的人物) 难度： 词数：约260 用时：7分钟
From birth we are told that once our ba

b

y teeth fall out and our adult teeth start to grow, and that is the final set of natural teeth we'll ever have. So if you lose adult teeth because of tooth decay (蛀牙) or an accident, you may have to replace them with false teeth.
However, dental expert Dr Katsu Takahashi has helped create a "world-first" medicine to encourage the regrowth of human teeth. "The idea of growing new teeth is eve

r

y dentist's dream," he s

a

y

s.
The medicine prevents a gene called USAG-1 from working. This gene is responsible for stopping tooth buds (牙蕾) in our mouth from ever growing into either ba

b

y or adult teeth. Researchers tested the medicine on mice, which have tooth buds similar to humans'. And th

e

y found that the new teeth grew successfully.
Reportedly, a Japanese medical company will test the medicine on humans in the next few months. Dr Takahashi s

a

y

s, "The medicine could help people who have an unusual disease called anodontia. The disease is when humans have no teeth at all in childhood or adulthood. " After the necessary tests, the researchers hope to make the medicine available to treat (治疗) kids aged 2 to 6 who have signs of this disease.
Dr Takahashi adds that he hopes the new medicine could be a new choice for those who want a full and natural smile. Some people are afraid to smile because of their bad teeth. And th

e

y are not confident. With the help of the new medicine, people can have good teeth again.
(C)1. Why did Dr Katsu Takahashi help create a "world-first" medicine?
A. To achieve his dream.
B. To help his teeth grow.
C. To help new teeth grow.
D. To study human teeth better.
(C)2. What did the researchers find after th

e

y tested the medicine on mice?
A. The mice lost their lives.
B. The mice's teeth were broken.
C. The mice had good new teeth.
D. The mice's new teeth were similar to humans'.
(B)3. In which section of the newspaper would you probably read this article?
A. Environment.
B. Technology.
C. Education.
D. Fashion.
(C)4. What is the purpose of the passage?
A. To describe a medical company.
B. To tell w

a

y

s of protecting teeth.
C. To show some achievements of the medicine.
D. To share differences between humans and mice.

答案： 1 - 4 CCBC