Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-147

(23) __________. This common struggle highlights a clear need among passengers. For this reason, designated 'quiet cars' on trains are not just a luxury, but an essential service. (24) __________

The journey of a salmon is one of nature's most amazing stories. Born (25) __________ the clean, fast-flowing freshwater of rivers, young salmon, called fry, spend their early lives growing. After a few months to a few years, (26) __________ of these young fish begin a dangerous migration downstream towards the ocean. The change from freshwater to saltwater is a huge challenge. They must also (27) __________ predators like birds and larger fish. If a salmon were human, it (28) __________ an incredible marathon runner for completing such a long and difficult trip.

After several years maturing in the nutrient-rich ocean, an internal instinct calls them back to the exact river where they were born. (29) __________, they begin their final, exhausting swim upstream, often for thousands of kilometers. This final migration has a significant (30) __________ on their bodies; they stop eating and use all their energy to swim against the current and leap over waterfalls. It's a testament to their incredible strength and determination.

The next generation of mobile internet, 5G, is arriving, and it promises to be more than just a minor speed upgrade. As the fifth generation of wireless technology, it offers speeds up to 100 times faster than 4G. This isn't just an improvement; it's a revolutionary step forward that could redefine how we interact with the digital world. The global rollout is creating excitement for a new era of connectivity.

For teenagers, the most immediate changes will be felt in daily digital life. Imagine downloading a full-HD movie in seconds, not minutes. With its extremely low latency—the delay before a data transfer begins—5G will make online gaming incredibly responsive and smooth. This also opens the door to high-quality cloud gaming services, allowing you to play complex games on your phone without needing powerful hardware.

In Vietnam, this future is getting closer. Major mobile carriers like Viettel and Vinaphone are actively expanding their 5G trial networks in large urban centers, including Hanoi and Ho Chi Minh City. While a nationwide network will take time to build, these initial rollouts are a crucial step. This means that residents in these cities will be the first to experience the significant performance boost that 5G provides.

Beyond faster downloads and better gaming, 5G is the foundation for future technologies. It will enable sophisticated Augmented Reality (AR) apps that can overlay digital information onto the real world through your phone’s camera. It will also support the Internet of Things (IoT), connecting everything from smart home devices to city infrastructure. The full impact of 5G is still unfolding, but it is set to change our smartphones and our world.

Food fortification, the practice of adding essential micronutrients like vitamins and minerals to staple foods, is a widely praised public health strategy. It enriches common items such as cereal, milk, and salt, (37) __________. However, an overlooked problem is emerging (38) __________, creating a risk of 'nutrient overload,' where people consume far more than the recommended daily amount of certain vitamins.

Many individuals regularly eat several fortified foods throughout the day, (39) __________. While fortification is undeniably beneficial in fighting deficiencies, the challenge is to find a balance, (40) __________. A well-managed approach ensures we receive the advantages of fortification without the unintended harm of consuming too much.

A. because our diets increasingly include many different fortified products

B. while also educating consumers about the risks of excessive intake

C. which means they might get more vitamins and minerals than their bodies need

D. making it a powerful tool to combat nutrient deficiencies on a large scale