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.
小题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小题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小题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