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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，證明了這一現象。
小題1:根據第二段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:根據第二段Write L on the left and R on the right.故填L
小題3:根據第二段可知當你閉上右眼，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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