Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-21

(23) __________ I was glad I had packed a small first-aid kit, which had everything I needed for just such a situation. (24) __________

A coral reef is an underwater ecosystem often called the "rainforest of the sea." It is a complex structure (25) __________ is built by tiny animals known as coral polyps. These polyps secrete calcium carbonate to create hard skeletons. Over thousands of years, these skeletons accumulate and form the massive structures we see today.

These reefs are incredibly important. (26) __________, they are home to about 25% of all marine species, providing food and shelter for fish, sea turtles, and countless other creatures. They also (27) __________ a vital role in protecting coastlines from storms and erosion. However, these beautiful ecosystems (28) __________ by numerous threats. For many years, pollution and overfishing have damaged them. More recently, rising sea temperatures (29) __________ to a widespread phenomenon called coral bleaching, which can kill the coral. It is a serious problem that requires our immediate (30) __________.

Have you ever found yourself scrolling endlessly through a comic on your phone? If so, you've likely discovered the world of webtoons. Originating from South Korea, webtoons are digital comics specifically created for smartphone screens. Unlike traditional paper comics, they use a long, vertical format, allowing readers to simply scroll down to continue the story. This unique design has helped them become an incredibly popular form of entertainment across the globe.

The main reason for their success is how perfectly they fit a mobile-first lifestyle. The vertical layout is convenient, as it allows for easy reading with one hand while commuting or relaxing. Instead of flipping pages, readers experience a seamless flow on an 'infinite canvas'. Unlike traditional comics, they are designed for a mobile-first experience, with panels and dialogue optimized for small screens, making the story immersive and easy to follow anywhere, anytime.

This global trend has a strong presence in Vietnam. Platforms like the Vinagame-owned Zalo Webtoon have attracted millions of readers. These platforms offer a rich library that includes both translated versions of popular Korean webtoons and original series created by talented Vietnamese artists. This combination provides local readers with a diverse range of stories, from international hits to content that reflects their own culture and experiences.

So, why are webtoons so addictive, especially for teenagers? A key factor is the frequent update schedule. Many series release new, short chapters once or twice a week, keeping readers constantly engaged and eager for the next installment. Furthermore, the sheer variety of genres—from romance and fantasy to thriller and comedy—ensures that there is a webtoon for every taste, making it a go-to entertainment choice for a new generation of readers.

An ecosystem is a delicate web of life where every species plays a part. However, this balance can be shattered by the introduction of an invasive species. A prime example is the zebra mussel in North America's Great Lakes. (37) __________. They attached to hard surfaces, clogging water pipes and costing millions in damages.

More devastatingly, they filtered massive amounts of plankton from the water, (38) __________. This single change triggered a chain reaction. (39) __________. The clearer water they created also allowed sunlight to penetrate deeper, (40) __________. This illustrates how one species can cause an entire ecosystem to unravel.

A. With less food, native fish populations declined, which in turn affected the birds that preyed on them

B. promoting the growth of harmful algae on the lakebed

C. Originally from Eastern Europe, these small mussels arrived in the 1980s and reproduced rapidly

D. which was the main food source for many native fish