题文

阅读理解。        It may seem easy to say that plants and animals are different. Any child can tell the difference between  a tree and a dog. But those differences are far deeper than just what they look like. The cells (细胞) that   plants are made up of are different. In other words, the cell wail of plants has something special.     First of all, it's important to find that not all plant cells have a cell wall. Besides, there are many  differences of a cell wall based on the kinds of plant. The following is meant to be what a plant cell wall is  like.      The cell wall of a plant is on the outside of the cell membrane (膜). It is usually hard and cannot be  bent easily, but the degree of flexibility (韧性) of the cell wall is different. It is based on the special use that   the cell has in keeping the plant alive. Cells that make up the trunk of a tree are clearly less flexible than   cells on a leaf.      Cell wails act in many ways. They serve to protect the plant. They provide support, as well as help in  the movement of chemicals and wastes into and out of the cell.  More importantly, they control the water   that goes in and out.  Plants must have good water controlling systems (系统), allowing them to keep   water during dry seasons, and get rid of unnecessary water. Plants can't walk around to find water, so  being able to control water is very important.      So there you have it , what a plant cell wall is. Of course, there are many other things that are not talked   about here. Knowing more about plant cell wails requires further study and research. 1. The best title of the passage can be _____.     A. Different Plants                       B. Different Animals     C. The Plant Cell Wall                   D. The Uses of Cells 2. From the first two paragraphs we can find that _____.     A. all plants have a ceil wall     B. plant cells and animal cells are the same     C. different kinds of plant have different cell walls     D. there are no differences between the cells of a tree and a dog 3. The underlined word "bent" in the passage is the closest in meaning to _____.     A. shape-changed       B. water-kept         C. sun-burnt           D. skin-broken 4. Cells in the trunk of a tree are _____ those on a leaf.     A. as flexible as                           B. not so flexible as    C. more important than                     D. less important than 5. What is the most important use of a plant cell wall?     A. To protect the plant.                     B. To provide support.     C. To move chemicals and wastes.           D. To control the water.

题型：阅读理解  难度：中档

答案

1—5: C C D B D

据专家权威分析，试题“阅读理解。 It may seem easy to say that plants and animals a..”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。