Question

It seems to be strange to you there is a blind spot(点) on the eyes. Here is an interesting experiment that can make something disappear, when one eye is open.

　　Make a card about the size of a postcard and write two English letters L and R on it, L on the left and R on the right. First, hold the card about 80 cm away and you see both the letters. Then close your right eye and look at the letter R only with your left eye. And now, as you move the card slowly towards you, you’ll find the letter L disappearing. But if you move the card nearer to your face, the letter will be seen again. Now do the same experiment with your left eye closed, you’ll find the letter R disappearing.

Why does the letter disappear? It is because there is a blind spot on the eye. When the image of the letter falls on the blind spot, it won’t be seen. That is why either of the letters disappears.

1.The writer of the passage thinks that _____ there is a blind spot on the eye.

A．few people know   B．no one knows      C．most people know   D．all the people know

2.In which order should you do the experiment?

①Hold the card  ②Move the card nearer   ③Close your right eye

④Write two English letters  ⑤Look at the letter R   ⑥Make a card

A．④⑥①②③⑤      B．①③⑥④⑤②      C．⑥①④③②⑤      D．⑥④①③⑤②

3.The passage mainly tells us _______.

A．how to find the blind spot                 B．an interesting experiment

C．where the blind spot is                   D．there is blind spot on the eye

Answer

1.A

2.D

3.D

【解析】

试题分析：这篇文章通过一个实验告诉我们，在我们的眼睛里有存在一个盲点，对于这个知识很少有人知道。

1.细节题。根据文章It seems to be strange to you there is a blind spot(点) on the eyes.可知，很少有人知道我们的眼睛有一个盲点。故选A

2.细节题。根据文章可知，我们做实验的顺序应该是：制作一个卡片，写上两个英语字母，举起卡片，闭上右眼，看字母R,移动卡片离眼睛更近。故选D

3.主旨题。这篇文章通过一个实验告诉我们，在我们的眼睛里有一个盲点。故选D

考点：科普类说明文