Question

Have you ever wished you could see in the dark as well as an animal? In action movies, we often see characters wearing special glasses that reveal（显示）things that can't be seen in darkness. Everything looks green, but we can see the shapes and outlines clearly. As a matter of fact, this is somewhat similar to the way animals' night vision (视力) works.

You may have noticed eyeshine in pictures of animals, or seen it for yourself when light hits an animal's eyes. Dogs, cats, and many other animals have tissue (组织) called the tapetum lucidum（光神经纤维层） in each eye. The purpose of this tissue is reflect (反射) light deeper into the eye. For many animals, it leads to their excellent night vision, and it helps them hunt.

Different types of animals have different colors of eyeshine. The light reflecting back from the eyes of dogs and cat is likely to be yellow. Rats and birds usually have eyes that shine red. Other animals’ eyes may reflect white, yellow, green, or pink light. In each case, the color is related to the type of cells that make up the tapetum lucidum, as well as the chemicals inside the cells.

Eyeshine has the function of improving animals' night vision, but humans have found other uses for it. For example, when people are searching for certain types of animals, their eyeshine may be helpful in recognizing or discovering them. Also, eyeshine has inspired humans to invent substance (物质) that reflect light at night. Strips containing this substance are used to warn us of safety risks such as  raised parts of roads. Even though humans cannot see so well at night, we have still found ways to benefit from this amazing animal feature.

1.How does the tapetum lucidum help animals' night vision?

A. It sends out light in the dark.    B. It makes everything appear green.

C. It reflects light back into the eyes.    D. It enables them to see colors at night.

2.How does the author mainly develop Paragraph 3?

A. By providing reasons.    B. By giving examples.

C. By following space order.    D. By doing experiments.

3.What can we learn about scientists' research on eyeshine?

A. They've put it to practical uses.

B. They're using it to protect some animals.

C. They're trying to include more animal types.

D. They've invented special glasses based on it.

4.What is the text mainly about?

A. How humans' night vision works.    B. Different colors of animals' eyes.

C. How animals see in the dark.    D. Eyeshine and its benefits.

Answer

1.C

2.B

3.A

4.D

【解析】

本文是一篇说明文。文章讲述的是Eyeshine和它的好处。

1.细节理解题。根据第二段中Dogs, cats, and many other animals have tissue (组织) called the tapetum lucidum（光神经纤维层） in each eye. The purpose of this tissue is reflect (反射) light deeper into the eye. For many animals, it leads to their excellent night vision, and it helps them hunt.可知，它反射光线回到眼睛来帮助动物的夜间视力。故选C。

2.推理判断题。根据第三段中Different types of animals have different colors of eyeshine. The light reflecting back from the eyes of dogs and cat is likely to be yellow. Rats and birds usually have eyes that shine red. Other animals’ eyes may reflect white, yellow, green, or pink light. 可知，作者主要是通过举例子来发展第3段的。故选B。

3.推理判断题。根据最后一段中eyeshine has inspired humans to invent substance (物质) that reflect light at night. Strips containing this substance are used to warn us of safety risks such as raised parts of roads.可知，我们能从科学家对眼睛的研究中了解到他们已经把它放在实际用途上。故选A。

4.主旨大意题。根据第二段第一句You may have noticed eyeshine in pictures of animals, or seen it for yourself when light hits an animal's eyes.第三段第一句Different types of animals have different colors of eyeshine.和第四段第一句Eyeshine has the function of improving animals' night vision, but humans have found other uses for it.可知，本文讲述的是Eyeshine和它的好处。故选D。