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