阅读三篇短文，从每小题所给的四个选项中，选出一个与短文内容相符的最佳选项。

1. At first, Earth was .
A. very hot
B. very cold
C. full of water
D. full of life
2. Which of the following can be put in the "▲"?
A. Life in Water
B. The Beginning of Life
C. More Plants and Animals
D. The Living Things
3. What can we know about dinosaurs according to the passage?
A. They were fast and strong.
B. They lived on Earth long ago.
C. They were of many sizes and shapes.
D. They died out because they could find little to eat.
4. "Today’s Earth" wants to tell us that .
A. Earth is very old
B. Earth has changed a lot over time
C. Earth is our home and we should protect it
D. Earth has many different kinds of plants and animals
5. You may read the passage in .
A. a storybook
B. a history textbook
C. a travel guidebook
D. a science magazine

1.A 2.B 3.B 4.C 5.D

【分析】
本题为阅读理解题，需结合原文内容逐一分析各小题：
1. 第1题需定位原文关于地球最初状态的描述，匹配选项；
2. 第2题需分析▲后段落的核心内容，提炼合适的标题；
3. 第3题需从原文提取关于恐龙的关键信息，验证选项；
4. 第4题需总结“Today’s Earth”段落的主旨，匹配选项；
5. 第5题需根据短文内容的属性，判断其可能的出处。
【解析】
1. 解析：根据第一篇短文第一段“A long time ago, Earth was just a ball of hot rocks and gases. It was very hot...”，可知最初的地球非常炎热，对应选项A。
2. 解析：▲后的段落主要讲述水中出现微小的简单生物，这些是地球生命的开端，因此标题应为“生命的开端”，对应选项B。
3. 解析：根据第三段“Long ago, dinosaurs lived on Earth. They were big and strong, but they died out millions of years ago.”，可知恐龙很久以前生活在地球上，对应选项B。
4. 解析：根据第四段“Earth is our home, and we need to take care of it. We should protect the air, water, and land...”，可知该段落主旨是告诉我们地球是家园，应保护它，对应选项C。
5. 解析：短文围绕地球的演化、生命发展等科学知识展开，最可能出自科学杂志，对应选项D。
【答案】
1.A 2.B 3.B 4.C 5.D
【知识点】
阅读理解（细节理解）、阅读理解（主旨大意）、阅读理解（推理判断）
【点评】
本题考查学生对科普类短文的阅读理解能力，涵盖细节定位、段落主旨提炼和内容推理，需学生仔细阅读原文，准确提取关键信息，整体难度适中。
【难度系数】
0.6