Đề ôn thi Đề thi vào lớp 10 Hà Tĩnh môn Tiếng Anh - Mã đề HTI-61

Have you ever thought about why you have different kinds of teeth? Each one is part of a team, and they (24) __________ a crucial role in digestion. Humans have four main types of teeth: incisors, canines, premolars, and molars. Each type has a specific job, from cutting to grinding. (25) __________ is why we can eat so many different kinds of food, from soft fruits to tough nuts.

The eight incisors at the front of your mouth are for biting into food. Next to them are the canines, which are the (26) __________ of all your teeth, perfect for tearing food. The main (27) __________ of the bigger teeth at the back—the premolars and molars—is to crush and grind. They are responsible for (28) __________ everything down into small, swallowable pieces. This teamwork makes digestion much easier for your stomach. Therefore, remember the old saying about taking care of them: an ounce of prevention is (29) __________ a pound of cure.

Rivers are the lifelines of our planet, flowing through landscapes and cities, supporting diverse ecosystems and providing essential water for millions. In our busy daily lives, we often see these rivers but may not think about their health. They are a critical part of our environment, but many face a silent crisis of pollution, turning them from sources of life into symbols of neglect.

The primary threats to river health come from human activities. Industrial factories often discharge chemical waste directly into the water. In rural areas, fertilizers and pesticides from farms can wash into rivers during heavy rain. This process, known as agricultural runoff, can seriously contaminate water sources. Furthermore, plastic bottles, bags, and other non-biodegradable trash frequently end up in rivers, harming aquatic animals and degrading water quality for everyone.

In Vietnam, this problem is very real. The To Lich River in Hanoi, for example, is a well-known case of severe urban water pollution. For years, it has struggled with waste and a dark, unpleasant appearance, making it a visible symbol of environmental challenges. Despite numerous cleanup projects and public promises, restoring the river to its former health has proven to be an incredibly difficult and complex task, showing just how long-term the damage can be.

Understanding the state of our local rivers is the first step towards protecting them. The health of these waterways is a direct reflection of the health of our community and our environment. As young citizens, being aware of the sources of pollution and supporting efforts to reduce waste can make a significant difference. The future of our rivers, and our cities, depends on the choices we make today.