Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-157

(23) __________ This choice comes with several compelling benefits, both for you and for the animal. (24) __________

Have you ever wondered why you see lightning before you hear thunder? During a thunderstorm, both are created at the exact same moment. The delay between seeing the flash and hearing the boom depends entirely (25) __________ the different speeds at which light and sound travel. The distance from the storm also (26) __________ the time gap between the two events.

Light travels at about 300,000 kilometers per second, while sound only moves at roughly 343 meters per second. (27) __________, you see the lightning almost immediately, no matter how far away it is. This scientific principle is true for (28) __________ single storm you observe. You can even (29) __________ how far away the lightning is. Just count the seconds between the flash and the thunder and divide by three to get the distance in kilometers.

If sound traveled as fast as light, we (30) __________ them at the exact same time.

Dengue fever is a serious viral infection transmitted to humans through the bite of an infected Aedes mosquito. It represents a major public health challenge, particularly in tropical and sub-tropical regions like Southeast Asia. In Vietnam, dengue outbreaks are common, especially during the rainy season. Therefore, understanding this disease and knowing how to prevent it are essential skills for every family to protect its members and the wider community.

When a person is infected, the first symptoms usually appear after 4 to 10 days. These often include a high fever, severe headache, pain behind the eyes, muscle and joint pains, and a skin rash. While many people recover within a week or so, dengue can sometimes become severe, leading to a dangerous condition called dengue hemorrhagic fever. This makes early detection and proper care very important for patients.

The most effective way to prevent dengue is to stop mosquitoes from breeding. The Aedes mosquito lays its eggs in standing water. These breeding grounds can be found in and around our homes in places like flower pots, old tires, and water storage containers. To control the mosquito population, we must eliminate these sources of standing water. Regularly checking and cleaning these areas can significantly reduce the risk of dengue transmission in our neighborhoods.

In addition to managing breeding sites, taking personal protective measures is also crucial. This includes wearing long-sleeved clothing, using mosquito repellent on exposed skin, and sleeping under a mosquito net, especially during the day when Aedes mosquitoes are most active. By taking these simple but effective steps, we can all contribute to creating a safer, dengue-free environment for ourselves and our families.

Many schools implement anti-bullying campaigns with the best of intentions, aiming to create a safe environment for all students. However, some common strategies can unintentionally discourage victims from speaking up. For instance, strict 'zero-tolerance' policies, which promise severe punishment for any form of bullying, can be intimidating. (37) __________.

Another common message advises students to confront their bullies directly. While this might seem empowering, it is not always practical or safe. (38) __________. Furthermore, some campaigns focus on group responsibility, (39) __________, which can make an individual feel isolated if they are the only one willing to speak up.

As a result of these misguided approaches, (40) __________, creating a cycle of silence that these campaigns were designed to break.

A. This can be dangerous and places an unfair burden on the person being targeted

B. many students choose not to report incidents at all

C. They may fear that they, or their friends, could also face harsh consequences for minor involvement

D. urging everyone to be an 'upstander' instead of a bystander