题文

阅读理解

Three kids have been learning chemistry for only a few months. But they have already begun to challenge a world famous scientist!        Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.        "We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."        British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.        But when the kids did some experiments in class last winter, they saw that the litmus paper didn't turn very blue with base matter. It's hard to get a clear result.        Will there be a better indicator than litmus paper? The three kids decided to try and find out!        How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.        The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper!        "It's our first scientific journey, Huang said, "But it makes me want to try harder."

1. Whom did the three kids want to challenge?

A. Their chemistry teacher.     B. Their headmaster. C. Robert Boyle               D. Thomas Edison

2. From the text, a red cabbage is a kind of ____.

A. plant B. animal C. paper D. liquid

3. What's the right order for the following sentences? a. Three kids collect red cabbage everywhere. b. The kids mixed pigments with acid and base. c. The kid ground the red cabbage. d. The kids get pigments from it.

A. a-b-c-d B. b-a-c-d C. a-c-d-b D. b-c-d-a

4. What is widely used as the acid-base indicator now?

A. red cabbage             B. litmus paper C. any plant                 D. any flower

5. The story mainly tells us ____.

A. how to make litmus paper     B. about the three kids' spirit C. scientist were wrong         D. the kids are heroes

题型：阅读理解  难度：中档

答案

1-5 C A C B B

据专家权威分析，试题“阅读理解 Three kids have been learning chemistry for only 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。