It seems to be strange to you 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, Lon 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' 11 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（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 eye.

A．few people know

B．no one knows

C．only you know

D．all the people know

小题2:The word "disappear" in the passage means_______ in Chinese.

A．驱散

B．消散

C．消失

D．遗失

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 tells us_______.

A．how to find the blind spot	B．an interesting experiment
C．where the blind spot is	D．there is a blind spot on the eyes.