【題目】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 (反彈) 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°

【答案】

【1】C

【2】D

【3】B

【解析】這是一篇科普類短文閱讀。介紹了光與反射。光是一種能攜帶能量的波，光線以直線形式傳播。有的物體本身不發(fā)光，我們能看到它是因?yàn)樗褎e的發(fā)光物體的光線反射到我們的眼睛。反射光線遵循反射定律，入射角等于反射角。

【1】C

細(xì)節(jié)理解題。根據(jù)短文中的句子“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.”可知，太陽是光源的一種，故答案為C。

【2】細(xì)節(jié)理解題。根據(jù)短文中的句子“The student sees the page when some of the reflected light rays enter the student’s eyes.”可知，，學(xué)生看到這個(gè)頁面是由于一些反射光進(jìn)入學(xué)生的眼睛。故答案為D。

【3】B

細(xì)節(jié)理解題。根據(jù)短文最后一段中的句子“The angle of incidence (入射角) is always the same as the angle of reflection. This is the law of reflection.”可知，入射角總是與反射角相同。入射角為35°，反射角也為35°，故答案為B。

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