閱讀理解。
     It seems to be strange to you there is a blind spot on the eye. 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
see the letter L disappearing. But if you move the card nearer to your lace, the letter will be seen again. Now
do the same experiment with your left eye closed, you'll see the letter R disappearing.
     Why did 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 disappear.
1. The word"disappear" in the first paragraph means _____.
[     ]
A. 消散
B. 丟失
C. 消失
D. 遺失
2. You fail to see the letter "L" in the experiment because _____.
[     ]
A. your eyes are poor
B. you move it close to your eye
C. its image falls on the blind spot
D. your left eye is not open
3. In which order (順序) should you do the experiment?
a. hold the card
b. move the card nearer
c. close your right eye
d. write two English letters
e. look at the letter R
f. make a card
[     ]
A. f-d-a-b-c-e
B. a-c-f-d-e-b
C. f-a-d-c-b-e
D. f-d-a-c-e-b
4. This passage mainly (主要) tells us _____.
[     ]
A. there is a blind spot on the eye
B. an interesting experiment
C. where the blind spot is
D. how to find the blind spot
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