It seems to be strange to you there is a blind spot (盲點)on the eyes. Here is an interesting experiment (實驗) that can make something disappear(消失) when one eye is open.
Make a card which is as big as a postcard, and write two English letters L and R on it. Write L on the left and R on the right. First, hold the card about 80 cm(厘米) 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.
小題1: Where should we write the two letters?
小題2:Which letter should be written on the left?
小題3:Which eye do you close when R disappear?
小題4:What will happen if the image (影像) of the letter falls on the blind spot?
小題5:.Do all people know that there is a blind spot (盲點)on their eyes?

小題1:On a card
小題2:L
小題3:Left eye.
小題4:It won’t be seen.
小題5:No.

試題分析：這篇短文主要介紹了人的眼睛上有個盲點。這件事很少有人知道。作者通過介紹試驗，證明了這一現(xiàn)象。
小題1:根據(jù)第二段Make a card which is as big as a postcard, and write two English letters L and R on it.可知把兩個字母寫在了卡片上，故填On a card
小題2:根據(jù)第二段Write L on the left and R on the right.故填L
小題3:根據(jù)第二段可知當(dāng)你閉上右眼，字母L就會消失，所以如果你閉上左眼，字母R就會消失，故填Left eye.
小題4:根據(jù)When the image (影像) of the letter falls on the blind spot, it won’t be seen.故填 It won’t be seen.
小題5:根據(jù)第一段有盲點對于你來說是奇怪的可知不是所有的人都知道這件事，故回答No.
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