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.