Đề ôn thi Đề thi vào lớp 10 Hải Phòng môn Tiếng Anh - Mã đề HPG-145

Many people are switching from manual to electric toothbrushes because they believe they are more effective. But how do they work? An electric toothbrush has a small motor inside its handle. When you (29) __________ on the power, this motor creates rapid vibrations or rotations. These movements are transferred to the brush head, which has bristles (30) __________ move back and forth or in circles at a very high speed.

This rapid motion allows the toothbrush to (31) __________ thousands of brush strokes per minute, far more than you could achieve manually. (32) __________, it can remove plaque more efficiently. Many models also include timers to ensure you brush for the recommended two minutes. Some advanced brushes even have pressure sensors. If too much pressure is applied, the user is alerted, which helps to (33) __________ the gums from damage. Overall, the technology that (34) __________ in an electric toothbrush makes daily dental care easier and more thorough for many users.

What exactly is a 'carbon footprint'? It is the total amount of greenhouse gases, particularly carbon dioxide, that are generated by our individual actions. Everything from the food we eat to the way we travel contributes to this total. For example, the electricity used to power our homes and the fuel burned by the motorbike we take to school both create emissions that affect our planet’s climate. Understanding this concept is the first step towards making a positive change.

As a developing nation, Vietnam has experienced rapid economic growth. This progress, while beneficial, has also led to an increase in the country's average carbon footprint. To address this, the Vietnamese government is implementing strategies to promote a low-carbon economy. The national plan aims to balance development with environmental protection, ensuring that as the country prospers, its environmental impact, or footprint, does not grow uncontrollably. The goal is to manage it sustainably for the future.

For teenagers, this global issue has very personal connections. The choice between riding a motorbike or a bicycle to school has a direct effect on the environment. Even seemingly minor actions, like how long you charge your smartphone or the type of snacks you buy, add up. It shows that your daily habits, both big and small, have a real and measurable consequence on the world. Your choices truly matter more than you might think.

The good news is that reducing your carbon footprint isn't overly complicated. You can make a difference by taking simple steps. For instance, you could use public transport more often, remember to turn off lights when you leave a room, or choose locally grown food to reduce transport-related emissions. When many people make these small changes together, the collective impact can be enormous and help protect our environment for future generations.