CHICAGO- Have you ever worked on your laptop computer with it sitting on your lap, heating up your legs? If so, you might want to rethink that habit from now on. Doing it a lot can lead to “toasted skin syndrome (症状)”, an unusual-looking spotted skin condition caused by long-term heat exposure (暴露), according to medical reports.

       In one recent case, a 12-year-old boy from California developed a skin discoloration on his left lap after playing computer games a few hours every day for several months. “He recognized that the laptop got hot on the left side; however, he did not change its position,” Swiss researches reported in an article published Monday in the journal Pediatrics.

      Another similar case is a Virginia law student who needed treatment for the spotted darkening on her leg. Dr. Kimberley Salkey, who treated the young woman, learned the student spent about six hours a day working with her computer placed on her lap. As Dr. Salkey later learnt, the temperature under the laptop could reach 51 degrees. That case, from 2007, is one of 10 laptop-related cases reported in medical journals in the past six years.

The condition can also be caused by overuse of heating pads (垫子) and other heat sources that usually aren't hot enough to cause burns. It's generally harmless but can also cause such permanent (永久的) skin darkening. In very rare cases, it can cause damage leading to skin cancers, said the Swiss researchers, Drs. Andreas Arnold and Peter Itin from University Hospital Basel. They do not mention any skin cancer cases linked to laptop use, but suggest, to be safe, placing a carrying case under the laptop if you have to hold it on your lap.

      Dr. Kimberley Salkey said that under the microscope, the affected skin is similar to skin damaged by long-term sun exposure.

      Major producers including Apple and Dell warn against placing laptops on laps or exposed skin for long periods of time because of the risks for burns. In the past, “toasted skin syndrome” has happened to workers whose jobs require being close to a heat source, including bakers and glass blowers, and in people who gathered near hot stoves to stay warm.

Dr. Anthony J. Mancini, chief at Children's Memorial Hospital in Chicago, said that it's unlikely that computer use would lead to cancer since it's so easy to avoid close skin contact (接触) with laptops.

    How green are you? Do you know how to be green?

    We all need a healthy environment, but we produce waste every day and it does harm to our environment. Though we are young, we can still do something to help. In fact, even the simplest everyday activities can make a real difference to the environment. Here are some ideas for you.

    Reduce

    Reduce means "use less". Don't waste things. This saves money and reduces pollution and waste going into the environment. Before we buy something new, think whether it is really necessary or maybe the old one will be just as good! When we do buy things, choose local products if possible, and try not to buy too many things from abroad.

    Reuse

    Reuse means "use again". Use things for as long as possible. When we buy things, make sure that they last a long time. We should look after them so that they will last, and we should repair them if we can instead of throwing them away and buying new ones. Don't use a paper cup of a paper bag. It's better to use a china cup and a lunch box because you can use them again.

    Recycle

    Recycle means "change things into something else". Though it takes energy to change something into something else, it's better than throwing things away or burning them. Find out what can be recycled in your neighbourhood and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees.

    So please remember these three words: reduce, reuse and recycle.

Lofton is a little village (村庄) in England. It is not far {#blank#}1{#/blank#} the city of Manchester. Not many {#blank#}2{#/blank#} (family) live around the village, so the people all know each other. Most of {#blank#}3{#/blank#} are {#blank#}4{#/blank#} (friend) and helpful. 

Though their homes are in Lofton, many people have jobs in Manchester. Most of these people go to work {#blank#}5{#/blank#}train. It usually takes about half an hour {#blank#}6{#/blank#} (go) from Lofton to Manchester. 

In the evening a lot of people like {#blank#}7{#/blank#} (watch) TV. But if they go to see a film or go to a concert (音乐会) , they have to go to Manchester. Because there {#blank#}8{#/blank#} (be) no cinemas in Lofton. 

Like many other villages near towns or cities, it is clean and quiet. So life in Lofton may not be so {#blank#}9{#/blank#} (excite) as the life in the big cities, but it can be just as big. That is {#blank#}10{#/blank#} people in Lofton love their village. 

Do you collect anything?Collecting is a popular hobby with people all around the world.Some people collect stamps,watches,or cars. {#blank#}1{#/blank#}.There are almost as many types of collections as there are collectors.

Coin collecting is one of the oldest and most popular types of collecting.People enjoy learning about coins and their history.They like to find unusual coins.Some see their collections as a valuable investment(有价值的投资). {#blank#}2{#/blank#}

{#blank#}3{#/blank#}Some coin collectors choose to collect coins from other countries.They may like coins from some countries or period better when they begin their collection.Another popular way to collect is to choose a theme(主题).{#blank#}4{#/blank#}.For example,a collector may look for coins with drawings of ships,birds,or flowers.

{#blank#}5{#/blank#} The type of the coin,the rarity(稀有度)of the coin,and how many people want the coin all have a say in this.If you have a rare coin that many people would like to own,it would worth a lot of money!

People pay close attention to 5G these years. So, what is 5G? The "G" stands for(代表) the generation of your mobile network.5G is the 5th generation mobile networks and it's a hundred times faster than 4G.

The first 5G video call was made on a Huawei Mate X smartph one on March 30, 2019. Shanghai has also become the first city in China to start testing 5G networks. Monaco became the first country in Europe to use a next-generation 5G mobile phone network based on technology from Chinese company Huawei.

It sounds obvious, but it's important to understand just how much faster 5G is compared to current 4G speeds. 5G will not only be many, many times faster than your existing connection, and it will be greatly faster than the broadband connection you have at home.

Now, 4G takes about 100 to 200 milliseconds to send and receive data. But 5G will get it down to 1 millisecond or less. This big change will not only make our mobile Internet faster. It can be used in many other ways as well.

For example, 5G will help make self-driving cars safer. Today's self- driving test cars have one problem—lag. When the car "sees" an obstacle(障碍), it sends this information to a data centre and receives instructions. However, it takes time to send and receive this information. With this kind of lag, the cars might crash because they don't receive instructions in time. With 5G, this lag will be greatly lowered, making the cars safer, according to CNN. 5G could also be used to power the Internet of Things (IOT). This refers to a large online network that connects all things and people. Fast Internet speeds will be the key to developing this technology. For example, with IOT under 5G, your fridge could automatically(自动地) place an order online for eggs when it finds that there are no eggs left inside.

All in all, 5G will shape every type of technology that it touches. And you won't have to wait too long for that to happen. Though we've seen a lot of positive progress just in the last year, we still have a long way to go before 5G is anywhere near as common as 4G is right now.