A
Boys and girls, let's do an experiment in today's lesson.
Materials

Water
A glass
Salt
Eggs
Instructions
(1) Fill the glass about $\frac{2}{3}$ full with water.
(2) Drop the egg carefully into the glass and watch it going down towards the bottom.
(3) Add about 5 spoons of salt and stir(搅拌) gently. Test to see if your egg goes up.
(4) Add more salt if the egg is still at the bottom.
The science behind it
Things go down in the water when they are denser than the water, and by adding salt we make the water denser. Once the water is denser than the egg, it goes up.
You can also try other things to see if you can have the same result.
() 1. What kind of lesson are the students having?
A. Maths.
B. Biology.
C. Physics.
D. Geography.
() 2. Which of the following is the result you can see after adding salt in water?

() 3. What does the underlined word "denser" probably mean?
A. Faster.
B. Slower.
C. Lighter.
D. Heavier.

1. C
2. C
3. D

【分析】
先通读全文，明确这是一篇结合浮力实验的英语阅读材料。第1题需根据实验涉及的科学原理判断课程类型；第2题依据实验步骤分析加盐后的结果；第3题结合文中科学逻辑猜测划线词词义。
【解析】
1. 第1题：文中提到做实验，且涉及浮力相关的物理原理，属于物理学科，故选C。
2. 第2题：根据实验步骤，加入足够盐后，鸡蛋会从杯底上浮，对应正确的结果图（选项C）。
3. 第3题：文中说明“物体比水重时下沉，加盐使水更重，水比鸡蛋重时鸡蛋上浮”，由此可知“denser”意为“更重的”，故选D。
【答案】1.C 2.C 3.D
【知识点】英语阅读理解，细节理解，词义猜测
【点评】本题为结合科学实验的英语阅读题，考查学生的信息提取和词义推断能力，难度适中。
【难度系数】0.5