Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-69

(23) __________. Together, these individual offerings create an impressive and diverse feast for everyone. This cooperative approach is the essence of a community potluck. (24) __________

Spider silk is a remarkable material (25) __________ has amazing properties of both strength and elasticity. The process of building a web often begins at night. First, a single thread is carried by the wind until it attaches to a branch or surface. This initial thread, called the bridge line, (26) __________ by the spider walking across it multiple times, adding more silk with each trip. This creates a strong foundation.

After the spider (27) __________ this foundation, it constructs the outer frame and the radial lines, which look like the spokes of a wheel. These spokes are not sticky. (28) __________, the final spiral thread, which is added next, is covered in tiny glue droplets. This sticky silk is essential because it (29) __________ the trap for unsuspecting insects. Finally, the spider creates a central hub where it can wait for a (30) __________ vibration from a captured fly.

For many teenagers, the morning alarm is a dreaded sound. Feeling constantly tired is a common complaint, often dismissed as laziness. However, science reveals a different story. Getting enough sleep isn't just about feeling rested; it's like unlocking a secret superpower that can dramatically improve a teenager's life in school and beyond. This is especially true in a demanding academic environment.

Biologically, a teenager's brain is still developing and requires about 8 to 10 hours of sleep per night, more than adults need. Their natural sleep-wake cycle, or circadian rhythm, also shifts, making them feel sleepy later at night. This biological need often clashes with early school start times and a busy social life. Making time for quality sleep is therefore crucial for academic success and overall well-being.

In Vietnam, this challenge is intensified by the culture of 'học thêm', or extra classes, which can run late into the evening. This creates a difficult choice between studying more or getting restorative sleep. The consequences of chronic sleep deprivation are serious. It can lead to poor concentration in class, difficulty remembering information for exams, increased stress, and even negative effects on mood and relationships.

So, what can be done? Viewing sleep as an essential tool rather than a luxury is the first step. Prioritizing sleep can lead to more efficient studying, better grades, a more positive mood, and even clearer skin. It’s not about losing time; it’s about investing in your brain and body. By harnessing the power of a full night's rest, teenagers can gain a significant advantage in all areas of their lives.

When your smartphone gets old, you might take it to a recycling program, thinking you're doing a good deed. However, the reality of "e-waste" recycling is often more complex and harmful than we imagine. (37) __________.

Instead, they often ship these old electronics to developing countries, (38) __________. This process exposes them to hazardous materials like lead and mercury, (39) __________. The global scale of this issue is enormous. (40) __________, and we must demand better regulations.

A. leading to serious health problems and environmental pollution

B. Many so-called recycling companies don't actually recycle the devices properly

C. Therefore, simply recycling your phone might not be the sustainable solution you think it is

D. where workers, including children, dismantle them in unsafe conditions