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.
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
2.The word “disappear” in the passage means ________
in Chinese.
A.出现 B.远离 C.消失 D.靠近
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
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
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