Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-07

Have you ever wondered how you can pay for something just by tapping your phone? This is possible thanks to Near Field Communication, or NFC. It is a type of wireless technology that allows for the transfer of data over very short distances. The main (35) __________ behind NFC is simplicity; it aims to make connections and transactions quick and effortless for everyone.

NFC works by using radio waves to enable communication (36) __________ two electronic devices when they are brought into (37) __________ proximity, usually no more than a few centimeters apart. Unlike Bluetooth or Wi-Fi, NFC does not require any manual pairing or password entry. The connection is established automatically when one NFC-enabled device enters the field of another.

One of the most widespread uses of NFC is for making mobile payments. Services like Apple Pay and Google Pay use NFC to let you (38) __________ secure payments at contactless terminals just by holding your phone near the reader. (39) __________, it is also used for quickly validating tickets for public transport, making daily commutes more convenient.

Beyond payments, NFC has other useful functions. It is excellent for sharing small amounts of data, such as contact information or web links, between phones. It is also great for pairing with accessories like headphones or speakers, (40) __________ simplifies connecting devices. In recent years, this technology (41) __________ increasingly popular for its ease of use.

Some people might worry about security, but NFC is designed to be quite safe. Because the devices must be so near, it is difficult for unauthorized parties to intercept the signal, and (42) __________ transaction is encrypted. This short-range feature is what makes NFC a secure choice for sensitive actions like paying for your shopping.

Imagine you are walking through a Vietnamese supermarket like GO! or Co.opmart. You see an entire aisle dedicated to 'healthy' snacks. The packaging is bright, with images of fresh fruit and claims like 'all-natural' and 'low-fat'. It's easy to grab a granola bar or a pack of baked vegetable chips, thinking you're making a good choice for a quick snack between classes. However, the reality behind these cleverly marketed products is often more complicated than it appears on the front of the box.

Food companies spend millions of dollars on creating packaging that is appealing to health-conscious consumers. They use green colours, earthy textures, and powerful words like 'organic', 'gluten-free', or 'contains real fruit'. These marketing strategies are designed to make you feel good about your purchase. The problem is that these labels can be misleading. A granola bar advertised as 'natural' might still contain as much sugar as a candy bar, and 'vegetable' chips are often just potato chips with a small amount of vegetable powder for colouring and flavour.

The nutritional truth is often hidden in the fine print. When a company removes one unhealthy ingredient, they often have to add another to make the product taste good. For example, products advertised as 'low-fat' frequently contain extra sugar, salt, or refined flour to compensate for the loss of flavour and texture. On the other hand, snacks labeled 'sugar-free' may contain high levels of unhealthy saturated fats or artificial sweeteners, which have their own potential health concerns. This trade-off is rarely mentioned on the front of the package.

So, how can you become a smarter snacker? The most important skill is learning to ignore the front-of-package marketing and turn the product over to read the nutrition facts label and ingredients list. First, look at the serving size; a small bag might contain two or three servings, meaning you are consuming double or triple the calories and sugar listed. Second, check the 'added sugars'—this reveals how much sugar was put in during processing, separate from the natural sugars in fruit. Finally, scan the ingredients list. If sugar or some form of syrup is one of the first few ingredients, the snack is likely not as healthy as it claims.

Ultimately, being an informed consumer is key. This doesn't mean all packaged snacks are bad, but it does mean we need to be critical thinkers. The best way to ensure you're eating healthily is to choose whole foods more often. An apple, a handful of unsalted nuts, or a small container of plain yogurt are fantastic options that don't come with confusing labels or hidden ingredients. By learning to see past the marketing, you can take control of your own health and make choices that are genuinely good for you.