单元 2 - 2A

Dinner typically refers to the main meal of the day, traditionally eaten in the evening or late afternoon. The exact timing of dinner can vary depending on cultural norms and personal schedules. It often consists of a substantial spread of dishes, including a protein source, such as meat, fish, or tofu, starches, like rice, potatoes, or pasta, vegetables, and sometimes soup or salad. Dessert may follow the main course, featuring sweets like cakes, pies, or fruit. Dinner provides an opportunity for individuals and families to come together, share a meal, and unwind after a busy day.

Lunch refers to the midday meal, typically eaten around noon or early afternoon. It is a time to refuel and recharge during the day, often consisting of a variety of foods such as sandwiches, salads, soups, or leftovers from dinner. Lunch can be enjoyed at home, school, work, or at restaurants and cafes, depending on individual preferences and schedules. It provides an opportunity to take a break from daily activities and nourish the body with a satisfying meal.

A subject is a specific area of knowledge or study. It refers to a particular field or topic that is taught or learned, such as mathematics, history, science, or literature. Each subject focuses on a distinct set of concepts, principles, and skills, helping individuals gain expertise in that area. Subjects can be broad, like social studies, or more specialized, like chemistry or philosophy. People choose or are assigned subjects to study based on their interests, career goals, or educational requirements. Subjects are typically taught in schools, colleges, and universities and can lead to deeper expertise in a specific field.

Biology is the study of living organisms, including their structure, function, growth, and interactions with their environment. It covers a wide range of topics, from the molecular mechanisms within cells to the behavior of entire ecosystems. Biology helps us understand the diversity of life on Earth, how organisms adapt to their surroundings, and the processes that sustain life, such as metabolism, reproduction, and evolution.

Chemistry is the scientific study of the composition, properties, and reactions of matter. Chemists explore how substances interact with one another, form new compounds, and undergo transformations. Chemistry is fundamental in fields like medicine, environmental science, and industry, as it helps create new materials, understand biological processes, and develop products from energy to pharmaceuticals.

Economics is the study of how people, businesses, and governments make choices regarding the use of resources. It looks at how goods and services are produced, distributed, and consumed, and how different factors like supply and demand affect the economy. Economics helps to understand financial systems and informs policy decisions related to growth, employment, and inflation.

Mathematics is the study of numbers, quantities, shapes, and patterns. It includes various fields like arithmetic, algebra, geometry, and calculus, all of which are used to solve problems and explain relationships between different elements. Mathematics is essential in everyday life and is widely applied in areas such as science, engineering, economics, and technology.

Geography is the study of the Earth’s physical features, climate, and the spatial relationships between places. It explores how natural and human-made features shape landscapes, environments, and human activities. Geography helps us understand the distribution of populations, resources, and the impact of human actions on the planet.

History is the study of past events, people, and societies, aiming to understand how they shaped the present. It examines records, artifacts, and documents to reconstruct and interpret past experiences, offering insights into the development of cultures, civilizations, and the world. History helps us learn from previous successes and failures to guide future actions.

Physical education is the study of physical fitness, sports, and health. It involves teaching students the importance of exercise, teamwork, and maintaining a healthy lifestyle through physical activity. Physical education also promotes skills like coordination, endurance, and strength, contributing to overall well-being.