Đề ôn thi Đề thi vào lớp 10 Trường Phổ thông Năng khiếu môn Tiếng Anh - Mã đề PTNK-34

The famous deep blue color of denim jeans is one of the most iconic shades in fashion. This unique color does not come from just any dye; it is the result of a traditional process using a special natural substance. This process gives blue jeans their signature look, which is recognized and loved all over the world.

The special (21) __________ used to color the cotton threads for denim is called indigo. Indigo is a natural pigment that comes from the leaves of the Indigofera plant. It is unique because, unlike many other dyes, it does not dissolve in water; therefore, it requires a special chemical process to be applied to fabric. This process has been used for centuries to create the rich blue color.

The dyeing process involves (22) __________ bundles of cotton yarn into large vats filled with a prepared indigo solution. When the yarn is first pulled out, it is not blue but a yellowish-green color. The color does not immediately take to the fibers. The real transformation happens next, in a step that seems like magic but is actually simple science.

This magical change is due to a process called oxidation. A chemist explained that the dye turned blue when it reacted with oxygen in the air. As the wet, yellow-green yarn is exposed to the air, the indigo molecules on the fibers oxidize and gradually turn into the deep blue we all know. This method is simple but effective; it really (23) __________.

Finally, the now-blue yarn is woven to create denim fabric. An interesting characteristic of indigo is that it fades over time, which gives each pair of jeans a unique, personal look. If denim (24) __________ with a different type of dye, it would not achieve this famous fading quality that so many people appreciate.

In today's digital age, online reviews are indispensable tools for consumers. Before trying a new restaurant or buying a product, many instinctively check ratings and comments, trusting them for genuine insights. However, this powerful system isn't always used as intended. Sometimes, these digital tools become weapons in a phenomenon called 'review bombing.' This occurs when a large group intentionally leaves a flood of negative reviews as a protest, regardless of their actual experience, turning a helpful guide into a tool for collective digital action. [I]

Review bombing is a potent form of digital activism. It typically erupts after a public controversy, like a viral video of poor customer service or an owner's statement sparking outrage. Suddenly, hundreds, even thousands, of one-star ratings and scathing comments appear, drastically plummeting a business's overall score. [II]

While review bombing might feel like a justified response, its impact on the targeted business can be devastating. For restaurants, a sudden drop in ratings means significant loss of customers and revenue. [III] Potential diners, seeing terrible average scores, will likely choose elsewhere, even if bad reviews are based on an isolated incident or a coordinated attack unrelated to food quality. This raises serious ethical questions: Is it fair to cripple a livelihood over a single event or a possibly exaggerated controversy? [IV]

For teenagers, who heavily rely on online reviews to decide where to go or what to buy, understanding review bombing is crucial. You might unknowingly base decisions on manipulated data. When a popular spot suddenly has terrible reviews, pause and ask why. Is it genuinely poor service, or a coordinated attack? Learning to distinguish authentic feedback from weaponized reviews helps you become a more discerning consumer. It teaches you to look beyond the star rating and critically read content before judging.

Ultimately, the power of online reviews comes with significant responsibility. While digital platforms offer avenues for accountability, they shouldn't be used for mass punishment or unverified protests. Being a responsible online citizen means contributing constructively. Before participating in a review bomb, or sharing content promoting one, consider the real-world consequences for businesses. Your digital footprint matters; using online platforms thoughtfully ensures they remain valuable resources, not instruments of digital vigilantism.