Dave is my friend. His family is rich. His parents always give him lots of pocket money. But Dave thinks his parents work very hard and it's not easy for them, so he always tries his best to save money. He has some good ways to do it.

    Dave likes reading. He has lots of books. He tells me he often buys books online, because they're cheaper. And when he has free time, he often goes to bookstores or libraries to do some reading.

    Dave has a bike. He usually goes to school by bike instead of taking a bus. Sometimes when it rains or snows, he walks. These two ways help Dave keep healthy and save some money.

    Dave brings a bottle of water to school every day. When other students drink juice, he enjoys his water. He thinks water is the cheapest but the best drink.

    Some students think Dave is mean. But I don't think so. I think he is right. What do you think of him?

    It's a picture of a small room. There is a girl in it. Her name is Sally. It' s her room. There is a bed and a desk in her room. What's that on the wall? It's a map of England. Next to the map we can see a photo. It's Sally's photo. We can see a clock on the desk. Is it her black cat on the bed? No, it's her hat. Where's her backpack? It's on her bed, too.

    In recent years, a number of Chinese technological innovation(科技创新) have been making waves around the world. Among them, four stand out. They are known as "four new great inventions" of modern China. They have made our daily lives more convenient

High-speed trains

    China created its first high-speed railway line in 2008. Since then, the number of passenger trips has grown by over 30 percent every year. By 2016, more than 5 billion trips had been taken China's bullet trains(高铁), according to Xinhua News Agency.

    China is currently working on the next-generation bullet trains that will have a top speed of 400kilometers per hour. By 2020, one-fifth of the country's 150,000-km railway network will be used by high-speed trains. This network will link more than 80percent of major cities across China, said Xinhua.

Mobile payment

    Mobile payment is turning China into a "cashless society" led by third-party payment companies like Alipay. For example, instead of paying y cash, customers now pay for goods simply by typing a short password into Alipay app on their mobile devices.

    Users can also pay their bills through Alipay, such as their water and electricity bills. Alipay also supports cross-border(跨境的)online and in-store payment, which allows users to buy things on international websites and apps.

Shared bikes

    Shared bike services started in Western countries. But China has surprised the world with how quickly it has adopted dockless(无桩的)shared bikes.

    Unlike traditional bike-sharing method, dockless bikes allow users to simply pick up or park a bike on the street through GPS and smartphone To unlock a bike, you just need to scan a QR code on a shared bike with a smartphone app     After you finish riding, you can park it at available parking areas, lock it and pay for ride through mobile payment services.

Online shopping

    With around 751 million internet users, China has long been the world's largest and fastest-growing online shopping market.

    Online shopping now accounts for 15.5 percent of total retail sales in China, according to Xinhua. Thanks to lower costs and fewer licensing requirements(执照要求),it's easier for sellers to open an online shop in China than a brick-and-mortar shop(实体店)。

    It also helped to create jobs of rural areas. In 2016, online shopping created more than 20 million jobs in rural areas, with over 8.1 million running their own online shops, said Xinhua.

    Do you wear large T-shirts and baggy jeans? Or do you like rap? If your answers are “yes”, I think you like Hip-Hop. Hip-Hop is very hot now.

    Hip-Hop music started in the middle of the 1970s in New York. It is a kind of popular dance music with a regular beat (规律的节奏) and spoken words. The music, break-dancing and graffiti(涂鸦) make up Western Hip-Hop culture. Most of the Hip-Hop songs are about love, jobs or even games.

    Usually in rap, singers speak words very quickly to a certain beat. Most of the words are fun. Singers play off words to make fun of themselves or others. Hip-Hop music has few rules. Singers just do what they think and rap it out in a clever or creative way. That's why a lot of kids fall in love with the music. Many of them like wearing large T-shirts and baggy jeans. Today Hip-Hop is more and more popular across most of the world.

    This graph shows the amount of electricity used in a small city. It is clear that the city uses more electricity in{#blank#}1{#/blank#}than in{#blank#}2{#/blank#}， In summer, people use the most electricity at 12:00. This is probably{#blank#}3{#/blank#}the high temperature at noon. In winter, people use the most electricity at{#blank#}4{#/blank#}. The graph also shows the amount of electricity used{#blank#}5{#/blank#}from 6:00 to 12:00. The amount of electricity used decreases(减少) from 18:00 to 24:00.

    Some people seem have unusual memories. Zheng Aiqiang, a" memory athlete" on TV show Super Brain, can remember 2, 660 numbers in just one hour!

    You would think people like him must have special brains. But

according to a recent study by researchers from America and Holland, the brain structure(结构) of ordinary people and 23 of the world's leading memory athletes shows no difference.

    Good memories can be trained. New research in the magazine Neuron suggests that a person will get a super memory with just six weeks of hard training.

    Researchers found that a technique (技巧) called loci, invented by the ancient Greeks, can greatly help improve memory.

    By using loci, you are using your imagination to improve the brain's memory networks. You can link (关联) something you need to remember with a place that you know very well. For example, to remember a list of numbers, imagine yourself walking through your house. Each thing is linked to a number. For example zero could be the handle on the door and five could be the painting on the wall.

    In one study, some ordinary people were given 20 minutes to remember 72 nouns. At the beginning, they could only remember 26 words, but when they were taught loci, they could remember 62 words.

    "Not everyone can become a memory winner. But everyone using the technique can improve his memory greatly," said Boris Konrad, one of the researchers in the study.

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