计算：﹣1³﹣$\sqrt{27}$+6sin60°+（π﹣3.14）⁰+|﹣$\sqrt{5}$|

哥白尼、牛顿和爱因斯坦被称为近代以来最伟大的科学家，其理论的共同之处是

       The clock struck(敲) eleven at night. The whole house was quiet. Everyone was in bed except me. Under the strong light, I looked sadly at a huge pile（堆） of those trouble things —books.
        I was going to have my exam the next day. “When can I go to bed?” I asked myself. I didn't answer. And I could not. The clock struck twelve. “Oh, dear! Ten more books to read before I go to bed!” We students are the most wretched ones in the world. Dad does not agree with me on this. He did not have to work so hard when he was a boy.
        The clock struck one. I was quite hopeless now. I forgot all I did learn. I was too tired to go on. I did the only thing I could. I prayed（祈祷）, “My god, please let me pass the exam tomorrow. I will work hard next time, Amen.” My eyes were so heavy that I could hardly open them. A few minutes later, with my head on the books, I fell asleep.

阅读下面短文，回答问题．

人类和某些动物的眼睛很像一架照相机．眼球内的晶状体相当于一个凸透镜，视网膜相当于光屏，我们看物体时，是通过睫状肌的伸缩来调节晶状体的弯曲程度，改变晶状体的焦距，使不同远近的物体都能在像距相同的视网膜上生成清晰的倒立实像，如图所示．

眼睛与照相机的不同处是：人的眼睛是通过调节焦距来获得清晰的像，普通照相机是通过改变像距使像变得清晰．

由眼睛的调节作用所能看清的最远点，叫远点，正常眼的远点在极远处．眼睛所能看清的最近的点，叫近点，正常眼的近点约距眼10cm．看物体时间较长也不易感到疲劳的距离叫明视距离，正常眼的明视距离25cm．从眼的光心向物体两端所引的两条直线的夹角叫视角，视角越大，对物体的观察就越清楚．

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