Now too much carbon dioxide, also known as CO₂ (二氧化碳) makes the Earth warmer and warmer. This brings bad effect to people. To save our Earth, more and more people adopt a new lifestyle called low-carbon life. Low carbon means using less energy and reducing (减少) greenhouse gases. It is necessary for everybody to learn to live a low-carbon life.

To live a low-carbon life, we’d better save as much energy as we can. For example, turn off the lights and TV when we don’t use them, use cold water to wash clothes or dishes, take a short shower and try to take a cold one when the weather gets warm.

To live a low carbon life, we can eat less meat. Keeping animals for food produces even more carbon dioxide than all the cars do in the world. Being a vegetarian (素食主义者) can help reduce one and a half ton of carbon dioxide a year.

To live a low-carbon life, we should plant more trees. Trees are very important for us. They can not only take in carbon dioxide and produce oxygen for us to breathe, but also take in the harmful gases and keep the air clean. To protect trees, we should stop people from cutting down too many trees and plant more trees.

If we can keep them a habit in our daily life, the Earth will become a better place for us to live in.

All students need to have good study habits (习惯). When you have good study habits, you learn things quickly. You also remember them quickly. Do you like to study in the living room? This is not a good place because it is usually too noisy. You need to study in a quiet place, like your bedroom. A quiet place will help you only think about one thing. When you study, don’t think about other things at the same time. Only think about your homework. If you do this, you will do your homework more quickly and you will make fewer mistakes (错误). Good study habits are very important. If you do not have them, try to learn them. If yours are already (已经) good, try to make them better.

Teens need about 9 to 11 hours of sleep every night to be their healthiest and do their best at school. 【小题1】 There are many reasons, including homework and evening activities. Here’s how you can get a better night’s sleep.

【小题2】 When you go to sleep at the same time every night, your body gets used to the schedule and you fall asleep more easily. If you want to get 10 hours of sleep and have to wake up at 7 a. m., you would need   to go to sleep at 9 p. m.

【小题3】. Wind down before going to bed so your body and mind are ready for sleep. You can divide the hour into three 20-minute parts this way: 20 minutes to prepare for the next day (pack your schoolbag, fill your water bottle and so on), 20 minutes for hygiene(shower and brush your teeth), and 20 minutes to relax (read a book or listen to calming music).

Avoid sleep stealers. 【小题4】 Try to avoid food and drinks with caffeine (tea, coffee,chocolate) in the afternoon and evening. Try not to send messages, scroll through your phone or play video games right before bed because the light from screens can trick your body into thinking it’s daytime.

【小题5】 It can take two weeks or even longer for your new sleep routine to work. If you can’t fall asleep after 20 minutes of lying in bed, it’s OK to get up and do something else for a while, like sitting in a comfortable chair to read, until you feel tired again.