题目内容

A

Light and Reflection

Light is another type of wave that carries energy. A source of light (光源) such as the sun or a light bulb gives off light rays that travel away from the light source in all directions.

A light ray is a narrow beam (光束) of light that travels in a straight line.

Most objects around you do not give off light on their own. They can be seen only if the light from another source bounces off (反弹) them and into your eyes. The process of light hitting an object and bouncing off is called reflection.

Look at the picture. The light is given off by the light bulb. Some of these light rays hit the page and are reflected (反射). The student sees the page when some of the reflected light rays enter the student’s eyes.

When a light ray hits a surface (表面) and is reflected, the reflected ray obeys the law of reflection. The angle of incidence (入射角) is always the same as the angle of reflection. This is the law of reflection. And this is true for any surface, no matter what material it is made of.

1.From the passage we know __________ is a source of light.

A. the eyes B. the moon C. the sun D. the book

2.From the passage we know that because of __________, the student can see the page.

A. the light bulb B. the book C. the light waves D. the reflected rays

3.According the last paragraph, if the angle of incidence is 35°, the angle of reflection should be _____.

A. 15° B. 35° C. 55° D. 70°

练习册系列答案
相关题目

Children across the world are taking pictures of their school meals. They are sending these pictures over the Internet to a young girl in Scotland. Then she shares the pictures and stories with people around the world.

The girl’s name is Martha. She likes to write. So Martha decided to start her own blog. Every day, Martha writes on the Internet about the meals she eats at school. She also takes pictures of the food.

Martha is very honest about the food. She does not just describe the food. She judges (评价) the taste of the food. She also judges how healthy the food is. Sometimes she likes the food, and sometimes she does not. Now, other people send pictures to Martha. Students around the world share their pictures of their school food!

Martha also started her blog for another important reason. She began to raise money for the organization (组织) Mary’s Meals. Mary’s Meals works in the East African country of Malawi. It provides food for children in schools. Martha encourages her readers to send money to Mary’s Meals to help build a kitchen.

Martha hoped to raise about 10,000 dollars. But the total reached 100,000 dollars and still keeps on growing!

Martha’s blog has also helped to improve meals at her school. Martha and her school friends found their meals improved since she started writing her blog.

No one knows what will happen to Martha’s blog in future. But already this girl has helped to change the eating experience of many children just by sharing pictures of her school meals.

1.Martha started her blog to ________.

A. ask her school to improve meals B. invite readers to judge school meals

C. show school meals around the world D. express her opinions about school meals

2.According to the passage, we can know Mary’s Meals ________.

A. works in Scotland B. provides food for school children in Malawi

C. was set up by Martha D. builds kitchens for poor families in Malawi

3.Martha ________ through her blog.

A. changed her eating habits B. helped poor children at her school

C. made meals at her school improve D. raised money for many organizations

4.What’s the best title for the passage?

A. Martha shares her food B. Cooking healthy school meals

C. Martha starts a blog D. Having school meals together

VI. 任务型阅读。(每空2分,共8分)

阅读下文并回答问题。

Some people seem to have extraordinary (非凡的)memories. Zheng Aiqiang, a “memory athlete” on TV show Super Brain, can remember 2,660 numbers in just one hour!

You would think people like this have special brains. But according to a recent study by researchers from the US and the Netherlands, the brain structures(结构)of ordinary people and 23 of the world’s leading memory athletes show no difference.

That’s because good memories can be trained. New research in the journal Neuron (神经元期刊) suggests that you can become a super memorizer with just six weeks of hard training.

Researchers found that technique (技巧)called loci, invented by ancient Greeks, can greatly help improve memory. By using loci, you are using your imagination to improve the brain’s memory networks. You can link(关联)something you need to remember with a place that you know very well. For example, to remember a list of numbers, imagine yourself walking through your house. Each thing is linked to a number. For example, zero could be handle(把手)on the door and five could be the painting on the wall.

In one study, some ordinary people were given 20 minutes to remember 72 words. First they could only remember 26 of them. But when they were taught loci, they could remember 62 words.

“Not everyone can become a memory champion. But everyone using the technique can improve a lot from the level they’re at,” said Boris Konrad, one of the researchers in the study.

1.Is Super Brain a TV show?

___________________________________________________________________________

2.Who was loci invented by?

___________________________________________________________________________

3.How can you remember more words in twenty minutes according to Paragraph 5?

___________________________________________________________________________

4.Is loci helpful to you? Why or why not?

____________________________________________________________________________

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网