题目内容：

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

You only have one pair of eyes, so take care of them! But do you know that it is tempting to think that your eyes are simply mirrors that reflect whatever is in front of them? Researchers, however, 1. ( show) that your brain is constantly working to create the 2. (impress) of an uninterrupted and continuous world. For instance, in the last 10 minutes, you have blinked (眨眼)your eyes around 200 times. You have probably not been aware of any 3. these interruptions in your visual world. Something you probably have not seen in a long time without the aid of mirrors 4. (be) your nose. It is always right there, down in the bottom comer of your vision, but your brain filters it out so that you are not aware of your nose 5. you purposefully look at it. Nor are you aware of the artery (动脉) 6. ( run) right down the middle of your retina (视网 膜).It creates 7. large blind spot in your visual field, but you never notice the hole it leaves. To see this blind spot 8. (clear) , try the following: cover your left eye with your hand. With your right eye, look at the 0 on the left. As you move your head 9. ( close) to the 0, the X will disappear as it enters the blind spot 10.(cause) by your optical nerve. Your brain works hard to make the world look continuous!