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閱讀理解。
　　It seems to be strange to you there is a blind spot on the eyes. 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
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.
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. most people know
D. all the people know
2. "a blind spot" in the passage means _____ in Chinese.
A.污點
B. 消散
C. 盲點
D. 遺失
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. you move it close to your eye
D. your left eye is not open
4. In which order (順序) 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
5. The passage mainly (主要) tells us _____.
A. how to find the blind spot    
B. an interesting experiment
C. where the blind spot is      
D. there is blind spot on the eye
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