题文

阅读理解。

What is the sky? Where is it? How bright is it? What lies above it? These questions are difficult to answer, aren't they?      Is the sky blue? The sky has no color. We know that there is air around the world. When planes fly, they need air to lift their wings. Planes can't fly very high because the air gets thinner when they go up higher. If we go up about 1,200 kilometers from the earth, we'll find no air there.      When we talk about the sky, we usually mean the atmosphere around the earth. It is like a very thick "cover" over the earth and keeps it warm. Without the "cover", the earth would be a very cold place and nothing could live on it.      Looking up above us, you will see the blue sky with white clouds. It is usually light blue, but the sky would be dark blue if you go to the top of the highest mountains. And you will see fewer clouds between you and the sun.      And if you sit in a spaceship high above the earth, there is no air at all. The sky would be so dark that its color would be black.      Sometimes the sky doesn't look blue. When the sun rises and falls, you will see red, orange, and other colors in the sky. These are the most beautiful moments of the day.      Now you may understand that we see colors because the air scatters (散射) the sunlight. Light travels through the air. Without air, there would be no light and no colors. 1. Planes can't fly very high because         . A. there is air around the world     B. the air gets thinner when they go up higher C. it's warmer in the sky     D. the air gets thicker when they go up higher 2. What's the meaning of the underlined word "atmosphere?" A. 氧气     B. 大气层     C. 蓝天     D. 气氛 3. We can see colors of the sky because         . A. the sun rises and falls every day     B. the sky has lots of colors C. the air scatters the sunlight     D. the sunlight has many colors 4. Which of the following is TRUE? A. There is little air without light and colors in the sky. B. The sky will look red, orange and other colors at noon. C. The sky has only one color when the sun rises and falls. D. The sky is dark blue if you go to the top of the highest mountains.

题型：阅读理解  难度：中档

答案

1-4 BBCD

据专家权威分析，试题“阅读理解。 What is the sky? Where is it? How bright is it?..”主要考查你对  科教类阅读  等考点的理解。关于这些考点的“档案”如下：

科教类阅读

考点名称：科教类阅读

• 科普类的阅读：
  科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。
  如果是介绍社会现象的文章，要掌握所谈现象的内涵。

• 答题技巧：
  1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和
     关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。
  2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。
  3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。