登录
B
Slides are simple but always fun. All you need to do is climb up to the top and slide down. But did you know that there is science behind this simple playground equipment?
Do you like science? Newton said what goes up must come down. He was talking about gravity（重力）. Slides work because of gravity. But that is not all.
①You climb up the slide and sit down. You are ready to go. Are you sliding down? No, not yet. Things stay still unless something makes them move. It is Newton's first law. So you have to give yourself a push to start the journey down.
②Now you are sliding down. Do you feel you are slowing down a bit? When two things rub（摩擦）against each other, they cause friction（摩擦力）. Without friction, you will slide down faster and faster to the bottom.
③At the bottom of the slide, you come to a full stop. Your feet touch the ground and add extra（额外的）friction. Newton's first law also says moving things keep moving unless something makes them stop. So, if you do not use your feet, you'll fly off the slide.
(
A. By giving a fact.
B. By giving an example.
C. By telling a story.
D. By asking a question.
(
(
A. You would stay still.
B. You would stop immediately.
C. You would add extra fiction.
D. You would slide uncontrollably.
(
A. Fun with a Slide
B. Science Behind a Slide
C. Newton's First Law
D. Secrets of Gravity
Slides are simple but always fun. All you need to do is climb up to the top and slide down. But did you know that there is science behind this simple playground equipment?
Do you like science? Newton said what goes up must come down. He was talking about gravity（重力）. Slides work because of gravity. But that is not all.
①You climb up the slide and sit down. You are ready to go. Are you sliding down? No, not yet. Things stay still unless something makes them move. It is Newton's first law. So you have to give yourself a push to start the journey down.
②Now you are sliding down. Do you feel you are slowing down a bit? When two things rub（摩擦）against each other, they cause friction（摩擦力）. Without friction, you will slide down faster and faster to the bottom.
③At the bottom of the slide, you come to a full stop. Your feet touch the ground and add extra（额外的）friction. Newton's first law also says moving things keep moving unless something makes them stop. So, if you do not use your feet, you'll fly off the slide.
(
A
)1. How does the writer start the text?A. By giving a fact.
B. By giving an example.
C. By telling a story.
D. By asking a question.
(
B
)2. Which picture explains why you slow down a bit when sliding down?(
D
)3. What would happen if you do not use your feet at the bottom of the slide?A. You would stay still.
B. You would stop immediately.
C. You would add extra fiction.
D. You would slide uncontrollably.
(
B
)4. What is the best title for the passage?A. Fun with a Slide
B. Science Behind a Slide
C. Newton's First Law
D. Secrets of Gravity
答案
1.A 2.B 3.D 4.B
解析
【分析】
这是一篇科普类英语阅读理解题，解题思路为：先通读全文把握核心内容，再针对每个问题回到原文定位关键信息，逐一分析选项得出答案。第1题考查文本开头的写作方式，需定位开头内容判断；第2题考查细节理解，需找到对应下滑减速原因的段落；第3题考查细节查找，定位原文关于不用脚的后果；第4题考查主旨大意，需总结全文核心内容。
【解析】
1. 第1题：文本开头作者先陈述“滑梯简单有趣，玩法是爬上滑下”这一事实，因此是通过给出事实开头，对应选项A。
2. 第2题：原文第②段指出“下滑时减速是因为摩擦，摩擦产生于两个相互摩擦的物体之间”，解释该原理的图片对应选项B。
3. 第3题：原文第③段明确说明“如果不用脚，你会滑离滑梯（失控）”，对应选项D。
4. 第4题：全文围绕滑梯背后的科学（重力、牛顿第一定律、摩擦力）展开，核心是滑梯背后的科学，因此最佳标题为选项B。
【答案】1.A 2.B 3.D 4.B
【知识点】阅读理解、细节理解、主旨大意
【点评】本文为科普类英语阅读，侧重考查学生对文本细节的定位能力和主旨的归纳能力，题目设置常规，需学生仔细阅读原文，准确提取关键信息，难度适中。
【难度系数】0.6
这是一篇科普类英语阅读理解题，解题思路为：先通读全文把握核心内容，再针对每个问题回到原文定位关键信息，逐一分析选项得出答案。第1题考查文本开头的写作方式，需定位开头内容判断；第2题考查细节理解，需找到对应下滑减速原因的段落；第3题考查细节查找，定位原文关于不用脚的后果；第4题考查主旨大意，需总结全文核心内容。
【解析】
1. 第1题：文本开头作者先陈述“滑梯简单有趣，玩法是爬上滑下”这一事实，因此是通过给出事实开头，对应选项A。
2. 第2题：原文第②段指出“下滑时减速是因为摩擦，摩擦产生于两个相互摩擦的物体之间”，解释该原理的图片对应选项B。
3. 第3题：原文第③段明确说明“如果不用脚，你会滑离滑梯（失控）”，对应选项D。
4. 第4题：全文围绕滑梯背后的科学（重力、牛顿第一定律、摩擦力）展开，核心是滑梯背后的科学，因此最佳标题为选项B。
【答案】1.A 2.B 3.D 4.B
【知识点】阅读理解、细节理解、主旨大意
【点评】本文为科普类英语阅读，侧重考查学生对文本细节的定位能力和主旨的归纳能力，题目设置常规，需学生仔细阅读原文，准确提取关键信息，难度适中。
【难度系数】0.6
