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二、阅读理解
A 热考内容 跨学科 KEY→P19
范畴:人与自我 主题:勤于动手 体裁:应用文 难度:★★★ 建议用时:5分钟 评价:/3
Can you make an egg float in water? In this simple science experiment, we take just a few minutes to test the laws of density(密度) and discover just how easy it is to make an egg float! Here's a page from the school experiment report.
| Date | September 19th, 2025 |
| Class | Class 1, Grade 8 |
| Purposes | • To make an egg float in water.
• To find out the science behind it. |
| Supplies Needed | • Two eggs • Two tall drinking glasses • Salt • Water |
| Experiment Steps | 1. Fill one tall drinking glass about 3/4 full of water.
2. Place one egg into the glass of water and watch it sink.
3. Fill the other tall drinking glass
about 3/4 full of water.
4. Add 3 tablespoons of salt and stir(搅拌) the water until the salt dissolves(溶解).
5. Place the other egg into the glass and watch it float. |
| Science Behind | • The egg will sink in regular tap water because the density of the egg is greater than the density of water. The egg's density is only slightly higher than water at 1.03 g/cm³, but that is enough to make the egg sink.
• When we add salt, the density of the salt water increases.
• Once the density of the salt water is greater than that of the egg, the egg will float. |
素材来源: Cool Science Experiments Headquarters
(
A. All objects will float in salt water.
B. The experiment will take a whole day to finish.
C. The egg's density changes when put into different glasses of water.
D. Adding more salt to the salt water may make the egg float higher.
(
A. ①②③④ B. ③④①② C. ①③②④ D. ③①②④
(
A. A record. B. A diary. C. A plan. D. A poster.
A 热考内容 跨学科 KEY→P19
范畴:人与自我 主题:勤于动手 体裁:应用文 难度:★★★ 建议用时:5分钟 评价:/3
Can you make an egg float in water? In this simple science experiment, we take just a few minutes to test the laws of density(密度) and discover just how easy it is to make an egg float! Here's a page from the school experiment report.
| Date | September 19th, 2025 |
| Class | Class 1, Grade 8 |
| Purposes | • To make an egg float in water.
• To find out the science behind it. |
| Supplies Needed | • Two eggs • Two tall drinking glasses • Salt • Water |
| Experiment Steps | 1. Fill one tall drinking glass about 3/4 full of water.
2. Place one egg into the glass of water and watch it sink.
3. Fill the other tall drinking glass
about 3/4 full of water.4. Add 3 tablespoons of salt and stir(搅拌) the water until the salt dissolves(溶解).
5. Place the other egg into the glass and watch it float. |
| Science Behind | • The egg will sink in regular tap water because the density of the egg is greater than the density of water. The egg's density is only slightly higher than water at 1.03 g/cm³, but that is enough to make the egg sink.
• When we add salt, the density of the salt water increases.
• Once the density of the salt water is greater than that of the egg, the egg will float. |
素材来源: Cool Science Experiments Headquarters
(
D
)1. What can we infer from the experiment?A. All objects will float in salt water.
B. The experiment will take a whole day to finish.
C. The egg's density changes when put into different glasses of water.
D. Adding more salt to the salt water may make the egg float higher.
(
B
)2. 新考法·信息排序 What is the CORRECT order of the following experiment steps?A. ①②③④ B. ③④①② C. ①③②④ D. ③①②④
(
A
)3. What kind of text is the page?A. A record. B. A diary. C. A plan. D. A poster.
答案
本文介绍了八年级一班于2025年9月19日进行的"如何让鸡蛋在水中漂浮"的实验,包含实验目的、材料、步骤及背后的科学原理。
1. D 推理判断题。根据Science Behind部分的内容可知,加盐越多,盐水密度越大,浮力越大,鸡蛋可能浮得更高。
2. B 信息排序题。实验的完整步骤为:第一个玻璃杯装四分之三的水;放入鸡蛋,观察下沉;第二个玻璃杯装四分之三的水;往第二个杯子里加入盐并搅拌;放入鸡蛋,观察漂浮。结合图片可知,所给的实验步骤的正确顺序为B项。
3. A 推理判断题。文本是学校实验报告的一页,记录了实验目的、材料、步骤和原理,属于实验记录。
1. D 推理判断题。根据Science Behind部分的内容可知,加盐越多,盐水密度越大,浮力越大,鸡蛋可能浮得更高。
2. B 信息排序题。实验的完整步骤为:第一个玻璃杯装四分之三的水;放入鸡蛋,观察下沉;第二个玻璃杯装四分之三的水;往第二个杯子里加入盐并搅拌;放入鸡蛋,观察漂浮。结合图片可知,所给的实验步骤的正确顺序为B项。
3. A 推理判断题。文本是学校实验报告的一页,记录了实验目的、材料、步骤和原理,属于实验记录。
