Đề ôn thi Đề thi vào lớp 10 Trường Phổ thông Năng khiếu môn Tiếng Anh - Mã đề PTNK-118

Have you ever wondered how the creamy butter you spread on your toast is made? The journey begins with a single, simple ingredient: cream. Cream is the thick, fatty part of milk that rises to the top. Before the butter-making process can start, this cream is separated from the rest of the milk. It is especially rich (21) __________ fat, which is the key component that will eventually be transformed into butter.

The transformation happens through a process called churning. A churn is the essential tool (22) __________ is used for this step. Historically, these were wooden barrels, but today, modern machinery is often used. Inside the churn, the cream is continuously agitated, meaning it is shaken or stirred very quickly. This constant movement forces the tiny fat globules suspended in the cream to collide and stick together.

As the fat globules stick together, they form a solid mass. (23) __________, the liquid part separates from these newly formed clumps of fat. This remaining liquid is not cream anymore; it is a thin, slightly sour liquid called buttermilk. The key moment in churning is when this separation becomes visible. You can literally see solid butter forming as the liquid buttermilk surrounds it.

Once the butter has formed into a solid lump, the process is not quite finished. Afterwards, most of the buttermilk is drained away, and the butter is often 'washed' with cold water. This helps to remove any last traces of buttermilk from the butter. Washing the butter is a crucial step because it improves the flavor and helps the butter stay fresh for longer. Without this step, the butter would spoil much more quickly.

This process, which has been used for centuries, is a great example of how a simple physical action can bring about a significant change in food. It shows the transformation of a liquid into a solid through purely mechanical means. The final (24) __________ is a delicious, creamy spread enjoyed around the world, all starting from the simple act of churning cream.

It’s a question many young people might ask: why go to the dentist when nothing hurts? If you're not experiencing pain, sensitivity, or a nagging toothache, a trip might seem unnecessary. Isn't the dentist for fixing problems? [I] Like maintaining a car before it breaks down, proactive dental visits are essential for a healthy smile long-term.

The truth is, many dental issues begin subtly, without immediate pain signals. A small cavity can develop slowly over months or years, gradually eroding enamel. By the time you feel pain, decay has often reached sensitive inner layers, making the problem more severe and complex, potentially requiring a root canal instead of a simple filling. Similarly, gum disease, affecting tissues supporting your teeth, can progress unnoticed, leading to bleeding gums and eventual tooth loss if not addressed early. [II]

This is where preventive dentistry shines. Regular check-ups, typically every six months, allow your dentist to spot silent problems before they escalate. During visits, dentists don't just look for cavities; they also check for gum disease, oral cancer, and other issues. Professional cleanings remove plaque and tartar buildup even the best brushing can miss, preventing cavities and inflammation. For teenagers, these habits are vital because your permanent teeth must last a lifetime. Caring for them now saves significant pain and costly treatments later. [III]

In many cultures, including Vietnam, the tendency has been to visit a dentist only when pain becomes unbearable. This reactive approach often means problems are already advanced, requiring more intensive and expensive interventions. [IV] However, a growing movement seeks to shift this mindset. Dental chains like Kim Dental are actively educating the public about the benefits of routine, preventive check-ups. They emphasize that investing time in regular care can prevent much larger issues, leading to better oral health for the entire community.

So, while it might seem odd to visit a dentist when you feel perfectly fine, it’s one of the smartest health decisions you can make. Embracing preventive dental care now means investing in your future self. It’s about ensuring your teeth remain strong, healthy, and pain-free, allowing you to enjoy food, speak clearly, and smile confidently for decades. Don't wait for pain to be your signal; make proactive dental care a part of your routine and protect your lifelong smile.