学霸专属练习题

学霸专属练习题
1. 英语阅读理解：
Throughout history, many great scientists have left an indelible mark on the scientific world. Their contributions have shaped our understanding of the universe and have paved the way for new discoveries. In this passage, we will focus on three such scientists – Albert Einstein, Marie Curie, and Isaac Newton.
Albert Einstein, a renowned physicist, is best known for his theory of relativity. His groundbreaking work revolutionized the field of physics. Einstein's theory challenged the previously held Newtonian physics and provided a new understanding of space, time, and gravity. His equation
E=mc², which describes the relationship between energy and mass, has become one of the most famous equations in the world.
Marie Curie, a pioneer in the field of radioactivity, made significant contributions to the field of physics and chemistry. She was the first woman to win a Nobel Prize and the only person to win Nobel Prizes in two different scientific fields. Curie's discoveries, such as the isolation of radium and polonium, have led to advancements in medical treatments and the development of nuclear energy.
Isaac Newton, a physicist and mathematician, is widely regarded as one of the most influential scientists in history. His laws of motion and universal gravitation laid the foundation for classical mechanics. Newton's laws describe the relationship between an object and the forces acting upon it,
providing a mathematical framework for understanding the motion of objects.
These three scientists have not only made groundbreaking discoveries but have also inspired future generations of scientists. Their dedication, perseverance, and curiosity have set the bar high for aspiring scientists. Their contributions continue to shape our understanding of the natural world and demonstrate the power of scientific inquiry.
2. 数学计算题：
Solve the following equations:
a) 2x + 5 = 13
b) 3(x - 4) = 15
c) 4x² + 9 = 73
a) Solution:
2x + 5 = 13
Subtract 5 from both sides:
2x = 8
Divide both sides by 2:
x = 4
b) Solution:
3(x - 4) = 15
Distribute the 3:
3x - 12 = 15
Add 12 to both sides:
3x = 27
Divide both sides by 3:
x = 9
c) Solution:
4x² + 9 = 73
Subtract 9 from both sides:
4x² = 64
Divide both sides by 4:
x² = 16
Take the square root of both sides: x = ±4
Therefore, the solutions are:
a) x = 4
b) x = 9
c) x = 4 or x = -4
3. 物理应用题：
A car travels at a constant speed of 60 km/h for 2 hours. Calculate the distance traveled by the car.
Solution:
The formula to calculate distance is distance = speed × time.
Given:
Speed = 60 km/h
Time = 2 hours
Calculating distance:
Distance = 60 km/h × 2 hours
Distance = 120 km
Therefore, the car has traveled a distance of 120 km.
4. 化学题目：
Balance the following chemical equation:
Fe + O₂ → Fe₂O₃
Solution:
To balance the equation, we need to ensure that the number of atoms of each element is equal on both sides.
Given equation: Fe + O₂ → Fe₂O₃
Balanced equation: 4Fe + 3O₂ → 2Fe₂O₃
In the balanced equation, there are 4 iron (Fe) atoms, 6 oxygen (O₂) molecules (which contain a total of 6 × 2 = 12 oxygen atoms), and 2 iron(III) oxide (Fe₂O₃) molecules, with a total of 2 × 2 = 4 iron atoms and 2 × 3 × 2 = 12 oxygen atoms. The number of atoms of each element is now equal on both sides of the equation.
5. 生物问题：
Describe the process of photosynthesis.
Photosynthesis is the process by which green plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (a form of sugar) and oxygen. It is a vital process that sustains life on Earth.
The process takes place in specialized structures within plant cells called chloroplasts. Inside the chloroplasts, there are pigments called chlorophyll that capture light energy from the sun. This light energy is then used in a series of chemical reactions to convert carbon dioxide and water into glucose and oxygen.
The overall equation for photosynthesis is:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
In this equation, carbon dioxide (CO₂) is combined with water (H₂O)
in the presence of sunlight and chlorophyll to produce glucose (C₆H₁₂O₆) and oxygen (O₂). The glucose produced during photosynthesis is used by plants as a source of energy and as a building block for other organic molecules.
Photosynthesis is essential for maintaining oxygen levels in the atmosphere and for providing a source of food and energy for plants and other organisms. Without photosynthesis, life as we know it would not be possible.。