Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-70

(23) __________ The morning started with a wave of nervousness, but things quickly began to look up. (24) __________

Have you ever noticed small bumps on your skin when you're cold or scared? These are called goosebumps. This reaction, known scientifically as piloerection, happens when tiny muscles at the base of (25) __________ hair follicle contract. This contraction causes the individual hair to (26) __________ up straight from the skin, creating the familiar bumps.

But why does this happen? In our animal ancestors, this was very useful. For example, if an early human felt cold, their raised hairs (27) __________ an insulating layer of air, helping them conserve body heat. It was a simple, biological way to (28) __________ with dropping temperatures. The reaction is not limited (29) __________ feeling cold; strong emotions like fear or excitement also trigger it. For an animal, this could make it look bigger and more threatening to a predator. (30) __________, since modern humans have much less body hair, this warming effect is not very significant. Goosebumps are simply a fascinating leftover from our evolutionary past.

Many people ask, "If my teeth don't hurt, why should I go to the dentist?" This is a common way of thinking, especially in places like Vietnam where dental visits are often linked to pain or emergencies. However, this reactive approach can lead to more serious problems in the future. The modern answer to this question lies in a simple but powerful idea: preventive care. It's about stopping problems before they even start.

Preventive dentistry is more than just fixing problems as they appear. It involves regular check-ups and professional cleanings, usually twice a year. During these visits, a dentist can find and treat small issues, like early-stage cavities, before they become major concerns. These actions can prevent the need for more complex and expensive treatments, such as root canals or tooth extractions. Think of it as routine maintenance for the most important tools you use every day: your teeth.

For teenagers, adopting this habit is particularly important. Your permanent teeth are the only set you will have for the rest of your life, so learning to care for them now is crucial. Good habits, including proper brushing, daily flossing, and regular dental visits, create a strong foundation for lifelong oral health. This not only protects your smile but also saves you from future pain and discomfort, and it saves your parents from unexpected, high costs.

Ultimately, visiting the dentist regularly is a shift from a reactive to a proactive mindset. Instead of waiting for a toothache to force you into the dental chair, you take control of your health. A small investment of time for a check-up now is one of the smartest decisions you can make for your future well-being, ensuring your smile stays healthy and bright for years to come.

The 'like' button, a familiar icon on social media, has profoundly altered our digital interactions since its introduction. (37) __________. This single click, however, triggers a complex psychological process in our brains.

When we receive a 'like', our brain releases a small amount of dopamine, the same chemical associated with pleasure and reward. (38) __________. Consequently, we are motivated to share more content, often subconsciously tailoring it to what we think will receive the most 'likes'. (39) __________. The pressure to maintain a 'likeable' online persona can also lead to anxiety and a fear of missing out. (40) __________.

A. This cycle reinforces our dependence on digital affirmation for self-esteem

B. Recognizing its power is the first step toward a more mindful online experience

C. It was originally created as a simple way to express positivity without needing to type a comment

D. This neurological response makes us feel validated and socially accepted