Question

The London Olympic Games are coming soon. This summer, Chinese sports fans will be able to watch the exciting games in 3-D on CCTV.

When you watch 3-D movies or TV, you have to wear a special pair of glasses. The 3-D glasses make the people and the things on the screen look like they are in the room with you.

3-D, means having three *dimensions: *width, height and *depth. 3-D technology is based on the way the human brain and eye work. Because the *pupils of a person’s eyes are about 6.5cm apart, when we look at something, each eye sees it from different *angle. Our eyes send the two pictures to our brain, and the brain puts them together. The small difference between the picture from the right eye and the picture from the left eye make us see depth.

While watching 2-D films, we don’t have to wear the special glasses. We see the pictures in two dimensions, each eye get the same information. This is because there is only one way of watching it.

So the aim of 3-D technology is to get a different picture into each eye of the person. It uses two film *projectors. One *projects a left eye picture and the other projects a right eye picture. When we are in the cinema, we can see different pictures in each eye at the same time with the help of the 3-D glasses.

While watching 3-D films, we feel that we are actually in the same environment as the things we are watching. However, some people are against watching 3-D films. One of the reasons is the 3-D glasses makes the screen of the film or TV look darker. It is bad for eyes. What’s more, people with eye problems may get headaches if they spend too much time watching 3-D movies, because their brains need to work harder to “read” the pictures.  

1.Paragraph 3 mainly tells us __________.

A．how we see things in 3-D                  B．how we watch the Olympic Games

C．how 3-D films are made                   D．where we watch 3-D films or TV

2.When we watch a 2-D film, each of our eyes get ________ information.

A．no               B．different          C．dark             D．the same

3.Which is the following is right according to the passage?

A．We don’t have to wear 3-D glasses if we watch games in 3-D on TV.

B．The 3-D technology is based on the way the human ear and eye work.

C．All the people can have fun watching 3-D movies or TV for a long time.

D．3-D glasses make us see different pictures in each eye at the same time.

4.Why are some people against watching 3-D films? Because ____________.

A．they make them more excited or sadder

B．3-D glasses make the screen look darker

C．3-D films make all people get headaches

D．they dislike watching the Olympic Games

Answer

1.A

2.D

3.B

4.B

【解析】

试题分析：这篇文章讲述了如果我们观看3D的电影或者电视的时候，我们必须带着3D眼镜，3D技术是基于人类大脑和眼睛的工作方式，3D眼镜使我们的两个眼睛在同一个时间看到不同的图片，然后大脑把它们综合起来。

1.细节题。从文章第三段我们知道了，我们是怎么观看到3D效果的东西的。故选A

2.细节题。根据文章While watching 2-D films, we don’t have to wear the special glasses. We see the pictures in two dimensions, each eye get the same information.可知，当我们观看2D电影时，我们的两个眼睛获得的相同的信息。故选D

3.细节题。根据文章可知，当我们观看3D电影时，必须带着3D眼镜，3D技术是基于人类大脑和眼睛的工作方式。如果人们长时间观看3D电影的话，就会头痛。3D眼镜使我们的两个眼睛在同一个时间看到不同的图片。故选D

4.细节题。根据文章One of the reasons is the 3-D glasses makes the screen of the film or TV look darker. What’s more, people with eye problems may get headaches if they spend too much time watching 3-D movies,可知，3D眼睛使电影屏幕更暗，如果长时间观看3D电影的话，人们的眼睛就会有问题，引起头痛。故选B

考点：科普类说明文