Sleep is something we all do. But some people need to sleep more than others. Babies sleep most of the time. Children in school sleep about ten to twelve hours a night. Most adults sleep only seven or eight hours.{#blank#}1{#/blank#}All parts of our bodies have to rest after they work.. Our arms need a rest after we lift heavy thing, When we run fast, our legs work hard. They get tired. We have to rest them. Our brains workhard, too.{#blank#}2{#/blank#} We can sit quite still and rest our arms andlegs. But our brains aren't resting. They go right on thinking as long as weare awake.

      Our brains slow down a bit when we sleep and dream.{#blank#}3{#/blank#} Instead of thinking wide-awake thoughts, our brains make up dreams. Some dreams are very pleasing. Some are not. Most of thetime we forget them when we wake up.

      Scientists have tried to find out what would happen if people were not allowed to sleep. They asked some people not to go to bed. The people stayed up all night and all the next day. They stayed up the next night too,and the day after. They played games, but they made mistakes. They forgot things.{#blank#}4{#/blank#} The people grew rude and mean. They became angry with their friends. Finally they were too tired to stand up. When they sat down, they fell asleep.

Scientists have found that if people are not allowed to sleep and to dream, they act in an unusual way.{#blank#}5{#/blank#}But we do know that we need it to stay well. So tonight have a goodsleep. Lie down under the covers. Shut your eyes. Let your thoughts wander.Soon you'll stop thinking. You'll be asleep.

A. It was hard for their tired brains to work.

B. When we are awake, they help us pay attention to the worldaround us

C. But babies, children, and adults—all of us need to haveour sleep

D. Good sleep helps to improve one's memory

E. No one knows why sleep is so good for us

F. But even as we sleep our brains are doing some work

G. Of course you will have a good sleep

    The evidence for harmony may not be obvious in some families. But it seems that four out of five young people now get on well with their parents, which is the opposite of the popularly-held image of unhappy teenagers locked in their room after endless family quarrels.

    An important new study into teenage attitudes surprisingly shows that their family life is more harmonious than it had ever been in the past. “We were surprised by just how positive today's young people seem to be about their families,” said one member of the research team. “They're expected to be rebellious(叛逆的) and selfish but actually they have other things on their minds: they want a car and material goods, and they worry about whether school is serving them well. There's more negotiation(商议) and discussion between parents and children, and children expect to take part in the family decision-making process. They don't want to rock the boat.”

    So it seems that this generation of parents is much more likely than parents of 30 years ago to treat their children as friends. “My parents are happy to discuss things with me and willing to listen to me,” says 17-year-old Daniel Lazall. “I always tell them when I'm going out clubbing. As long as they know what I'm doing, they're fine with me.” Susan Crome, who is now 21, agrees. “Looking back on the last 10 years, there was a lot of what you could call negotiation. For example, as long as I'd done all my homework, I could go out on a Saturday night. But I think my grandparents were a lot stricter with my parents than that.”

    Maybe this positive view of family life should not be unexpected. It is possible that the idea of teenage rebellion(反抗) is not rooted in real facts. A researcher comments, “Our surprise that teenagers say they get along well with their parents comes because of a brief period in our social history when teenagers were regarded as different beings. But that idea of rebelling and breaking away from their parents really only happened during that one time in the 1960s when everyone rebelled. The normal situation throughout history has been a smooth change from helping out with the family business to taking it over. ”

    Five meteorologists (气象学家) who were trapped for two weeks after polar bears surrounded their weather station are now able to leave after the creatures were chased away. Their supervisor told NBC News early Wednesday.

    Russian officials had feared the siege could last for another month, the time it would take to reach the islands in the Kara Sea, high in the Arctic Circle. But on Tuesday night a research ship took a detour (绕道) to assist those weathermen, station supervisor Vasily Shevchenko told NBC News. The ship run by Russia's state-run oil firm Rosneft frightened away the bears using its helicopter, before resupplying the weather station with more food and puppies (幼犬) . The puppies are not yet big enough to deter the bears, but the station is planning to draft in a replacement adult guard dog as soon as possible.

    Some of the bears had taken to sleeping directly outside the windows of remote outpost. There was no risk of the researchers starving because they had a year's worth of food, but they were forced to take dangerous trips to a nearby building, holding a gun for protection, according to Shevchenko.

    Polar bears are an endangered species. In Russia, it's a crime to shoot them unless in self-defense. The bears usually leave the islands in the summer, but this time they were trapped by the melting ice, an apparent sign of climate change, according to Shevchenko. “They've stayed on the island because there is nowhere for them to go,” he said.

    The animals suffer from global warming because it shrinks the floating ice that forms their main hunting ground. According to the environmental group the World Wide Fund for Nature, known as the WWF, this has got some polar bears to go near human habitats in search of food.

    A mechanical bicycle lock, like a U-lock, should be attached to a solid and immobile object like a rack (架子) to ensure safety. However, these racks are quite rare and popular, thus often occupied and although a bicycle lock prevents the bike from being carried away, as it fixes single parts like the frame or the wheels, other parts can be dismounted. Therefore an electronic system, consisting of several sensors, can extend the range of protection with only few components and less effort.

    The ‘FID Bikealarm' is a motion sensitive electronic alarm system that is attached to the rails of a bike saddle (座椅). Featuring omnidirectional (全方位) movement sensing to detect tiny movements or speeding-up and a small whistle emitting >120dB alarm sound to scare off potential thieves by arousing attention.

    The internal microcontroller uses a complex computer program to distinguish between a serious theft and harmless shaking movement as it senses and adapts to the environment. The usage is quite simple: identify yourself by holding the RFID tag close to the case to lock or unlock the alarm system signaled by feedback sounds. The RFID-technology is predestined for achieving this simple and secure interaction because it doesn't require any complex system, interaction or other devices—just a small tag.

    The ‘RFID Bikcalarm' is meant to be a useful add-on to mechanical bicycle locks as it massively extends the range of protection with few components. It is low-cost, durable and easy to use. The internal battery can be charged by USB.

    Home gardening is an enjoyable family activity. It brings many benefits to your body's health, your wallet and the environment. There is the fun of growing whatever pleases you all year round. And you can get the freshest and safest vegetables.

    However, being a home gardener in modern society is tricky. As you have too much to do every day and have no time to take good care of them, all your plants may die. Luckily, there are many gardening apps that are helpful in teaching the art of growing a wonderful garden.

    One of them is Gardenia. It can provide a great deal of information for crazy gradeners who want to increase their gardening skills and continue growing fresh produce. If you've got a smart phone with this app, everything becomes a lot easier, whether you are a beginner or an expert in home gardening.

    Gardenia is designed to teach you the best gardening tips, and it can predict how fast the plants much have grown and what needs to be done. It is light with a beautiful interface (界面), user - friendly and easy to use. Anyway, Gardenia is a perfect planting organizer for you to use and plan your green tasks. It was developed by an experienced home gardener.

    The best thing about this app is its over 90,000 different plants library for you to choose and the right way of planting each of them. More importantly, it helps everyone recognize a plant that grows well in their local area. So it's always something you deserve to enjoy! Do use it on your phone if you're really interested in gardening.

Tired of having the same old travel experiences that leave you feeling unfulfilled (失望的) and disconnected? Mindful travel is offering a new way to explore the world that is meaningful and sustainable.

Mindful travel is a concept that encourages individuals to fully dive into the present moment while exploring new destinations. Individuals are aware of their surroundings, engaging all the senses, and enjoying the beauty of each experience. {#blank#}1{#/blank#}

Mindful travel is not just about the destination but also the journey. The goal is to create a positive impact on both individuals and the world around them. {#blank#}2{#/blank#} It is an opportunity for people to positively contribute to the world.

Mindful travel provides an opportunity to disconnect from the stresses of everyday life. {#blank#}3{#/blank#} Whether it's wandering through a busy market, hiking in nature, or simply sitting by the ocean, it allows us to let go of our worries and fully enjoy the beauty of our surroundings.

{#blank#}4{#/blank#} By stepping out of our comfort zones and experiencing new cultures, we gain a fresh viewpoint on life. We become more open-minded, adaptable, and caring. Through interactions with locals and fellow travelers, we learn about different ways of life and develop a greater understanding of the world.

Mindful travel also has a positive impact on the destinations we visit. Mindful travelers are aware of their impact on the environment. {#blank#}5{#/blank#} By choosing eco-friendly accommodations, supporting local businesses, and respecting cultural traditions, we can ensure that our travels leave a green footprint.