Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-54

The Sun is the star at the center of (35) __________ Solar System. It is a nearly perfect ball of hot plasma, and its gravity holds the solar system together. For us on Earth, it is the most important source of energy, providing the heat and light that make life possible. But have you ever wondered how this giant star produces such an incredible amount of power?

The answer lies deep within the Sun's core. The core is the hottest and densest part of the Sun. The immense pressure and extreme temperatures, reaching over 15 million degrees Celsius, (36) __________ the perfect conditions for a powerful process. It is here that the Sun’s energy is born.

The pressure is so great and the temperature so high that atoms are stripped of their electrons. (37) __________, the core is a sea of atomic nuclei. In this extreme environment, hydrogen nuclei, which are just single protons, are forced to continue (38) __________ together. This process is known as nuclear fusion.

During nuclear fusion, four hydrogen nuclei combine to create one helium nucleus. A tiny amount of mass from the hydrogen atoms does not become part of the helium; instead, it (39) __________ a tremendous amount of energy. A famous scientist once explained that the energy (40) __________ for thousands of years to reach the Sun's surface from the core.

If this constant energy production (41) __________ suddenly, our planet would freeze. This energy travels from the core to the surface and then radiates out into space. A small fraction of this energy reaches Earth as light and heat. The amount of power the sun releases every second is, to (42) __________, almost impossible to imagine.

When you travel to another country, you are more than just a tourist with a camera; you become an unofficial ambassador for your homeland. Every interaction you have, from ordering food to visiting historical sites, contributes to the impression you leave behind. For a young Vietnamese traveler, this is a unique opportunity to represent your culture positively on the global stage. Being a good guest isn't just about following rules; it's about showing respect and building bridges between cultures.

Why does this matter so much? Responsible tourism has a powerful effect. It helps to break down negative stereotypes and fosters genuine human connections. When tourists show respect for local traditions, they are often welcomed more warmly, leading to a richer and more authentic experience. This principle is even promoted within Vietnam, where campaigns encourage visitors to act respectfully. By practicing good etiquette abroad, you are participating in a global movement of mindful travel that benefits both the visitor and the host community.

The first step to being a great guest is to do your homework before you leave. Every culture has its own set of unwritten social rules. Researching topics like tipping customs can save you from awkward situations. For example, while tipping is expected in the United States, it can be considered impolite in Japan. Similarly, understanding appropriate dress codes is vital. When visiting religious or sacred sites, such as temples or churches, it is crucial to wear modest clothing that covers your shoulders and knees as a sign of respect.

Communication is another key aspect. You don't need to be fluent in the local language, but learning a few basic phrases like 'Hello,' 'Please,' and 'Thank you' can make a huge difference. This simple effort shows locals that you value their culture. Even if your pronunciation isn't perfect, people will appreciate the gesture. As a result, they are often more willing to be friendly and helpful, opening doors to more meaningful interactions beyond typical tourist transactions.

Ultimately, being a good international guest is a mindset. It’s about moving through the world with curiosity, humility, and an open heart. By dressing thoughtfully, speaking politely, and respecting local traditions, you do more than just avoid causing offense. You enrich your own journey, create positive memories, and leave behind a lasting, favorable impression of yourself and, by extension, of Vietnam. You show the world the respect that you would hope to receive in your own country.