It seems to be strange to you that there is a blind spot (盲点)on the eyes. Here is an interesting experiment (实验) 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 eyes. When the image (影像) 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 eyes.
A．few people know
B．no one knows
C．most people know
D．all the people know小题2:The word “disappear” in the passage means ________ in Chinese.
A．出现
B．远离
C．消失
D．靠近小题3:You fail to see the letter L in the experiment because ________.
A．your eyes are poor
B．its image falls on the blind spot
C．your left eye is not open
D．you move it close to your eye小题4:In which order (顺序) 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5:The passage mainly (主要) tells us ________.
A．the blind spot can move
B．an interesting experiment
C．where the blind spot is
D．there is a blind spot on the eyes
