A blocked airway(呼吸道) can kill someone in three to four minutes, but it can take more than eight minutes for an ambulance to arrive. So a simple procedure such as opening someone's airway can save their life while they're waiting for emergency medical help. This means you're more likely to give first aid to someone you know than a stranger.

    There are many misconceptions (误解) surrounding first aid. Below are the ‘most popular' ones with details of what you should do.

    You should put butter or cream on a burn. The only thing you should put on a burn is cold water — keep the butter for cooking. Put the affected area under cold running water for at least ten minutes.

    The best way to treat bleeding is to put the wound under a tap. If you put a bleeding wound under a tap you wash away the body's clotting agents(凝血剂) and make it bleed more. Instead put pressure on the wound with whatever is available to stop or slow down the flow of blood. As soon as possible call 999. Keep pressure on the wound until help arrives.

    Nosebleeds are best treated by putting the head back. If you put the head back during a nosebleed, all the blood goes down the back of the airway. Instead advise them to tilt(倾斜) their head forwards and ask the person to pinch(捏) the end of their nose and breathe through their mouth.

    You need lots of training to do first aid. You don't — what you mostly need is common sense. You can learn enough first aid in a few minutes to save someone's life — whether it's from a book, attending a course or watching videos online.

    Remember: anyone can save a life

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    Actually, long-distance bicycle camping is one of the most pleasurable activities I have ever experienced.

    I generally sleep poorly at night, but in the woods on a tour, I sleep like a baby, falling asleep with the music of insects. In the morning, I am awakened by the cheeps of birds. I eat a snack before getting up, and then I quickly pack my sleeping bag, air mattress (垫), tent, and other things and get on with my road. I'm slower in the morning, having less speed but a greater desire to stop at pleasant spots and enjoy the beautiful scenery. Traveling by bike allows me to stop anywhere, such as grasslands, lakes, woods, and scenic spots. Near lunch, I find a small grocery and buy some bread, sandwiches and fruit. Then I will find a town park or other shady spots to wait out the high mid-day sun. In the afternoon, my speeds are higher, and I spend less time on stops. In the late afternoon, I start riding more slowly, and I start thinking about where I will stop. I finally find a place in the early evening, cook a simple meal and have a rest. As it starts to get dark, I put up my tent, crawl in and fall asleep.

    There are exciting times and difficult times as well. Visiting strange or famous places and accomplishing goals are always exciting to me. I meet and talk with interesting people along the way, sometimes other traveling cyclists. Appreciating beautiful views, meeting wild animals, and traveling up and down hills also. On the other hand, I may run into a rainy or hot spell(一段时间), have to repair my bike, or just find myself in a bad mood. The problems are infrequent and are easy to deal with. The pleasures remain in my mind for years.

    When we talk about Americans barely into adulthood who are saddled with(担负着) unbearable levels of debt' the conversation is almost always about student loan debt. But there's a growing body of evidence suggesting that today's young adults are also drowning in credit-card debt and that many of them will take this debt to their graves（坟墓）.

    More than 20% overspent their income by more than $ 100 every single month. Since they haven't built up their credit histories yet, it's a safe bet that these young adults are paying relatively high interest rates on the resulting credit card debt.

    Although many young people blame "socializing" as a barrier to saving money, most of them aren't purchasing $ 20 drinks in trendy bars. They're struggling with much more daily financial demands.

    To a disturbingly large extent, the young and the broke are relying on credit cards to make it until their next payday. This obviously isn't permanent in the long run, and it's going to put a huge drag on their spending power even after they reach their peak earning years, because they'll still be paying interest on that bottle of orange juice or box of spaghetti (意式面条）they bought a decade earlier.

    A new study out of Ohio State University found that young adults are accumulating credit card debt at a more rapid rate than other age groups, and that they're slower at paying it off. "If what we found continues to hold true, we may have more elderly people with substantial financial problems in the future'" warns Lucia Dunn, professor of economics at Ohio State. "If our findings persist, we may be faced with a financial crisis among elderly people who can't pay off their credit cards."

    Dunn says a lot of these young people are never going to get out from under their credit card debt. "Many people are borrowing on credit cards so heavily that payoff rates at these levels are not plenty to recover their credit card debt by the end of their life which could have loss impacts for the credit card issuing banks,"

    More than 40 percent of the species that help with pollination (植物传粉) are under threat due to the polluted environment. So some researchers have been searching for ways to protect the bees and other crucial pollinators while some engineers have thought perhaps an army of robotic pollinators could keep humans well-supplied in these foods. A team of researchers has recently designed a small drone capable of pollinating flowers. They tested their device on the large, pink flowers of lilies. And it worked.

    Exciting as this success was, it is only the first step. The team has yet to figure out how to apply the concept on the massive scale. Could a fleet of robo-pollinators replace the bees?

    “Although the answer isn't a straightforward no, it would be a challenging leap to go from this one little drone pollinating one large flower to an army of drones spreading across fields of crops,” says Scott Swinton, an agricultural economist at Michigan State University.

    “The successful pollination was fascinating,” Scott Swinton says, “but the device itself might damage the flowers. I wonder how you make sure you're not doing more harm than good to flowers when you have a drone.”

    “Furthermore,” he points out, “a lily is a particularly easy flower for a drone to pollinate. To make this more broadly applicable for smaller and more complex flower structures, the drones would need to be particularly agile.”

    Still, Joshua Campbell, an expert at the University of Florida, says “Pollination systems are extremely complex and will always require insects. There is no substitute for bees.”

    “As for the technology itself, it is a promising new development in existing drone technology,” he added. Yet he still sees some hurdles ahead before drones can be applied on a large scale.

    Many automobile makers present their newest designs at car shows around the world. Many designers seek to create the car of the future. One device that is popular among car manufacturers(生产商) is an autopilot. Autopilot permits a car to drive itself without human control.

    A recent car show in Geneva, Switzerland also presented other possible designs, including cars manufactured in 3-D printers.

    Rinspeed is a Swiss design company. It showed a vehicle based on the US electric car Tesla Model S, but the Rinspeed car includes a large television and an espresso coffee maker.

    Frank Rinderknecht is the CEO of Rinspeed. He says he does not want to just sit and watch the steering wheel(方向盘) turn as he rides in a car with autopilot.

    "I want to ride; I want to sleep, relax, watch movies, news, anything else. So that's the vision which we have. One day on the boring motorway traffic, you just do anything which makes your life better," said Rinderknecht.

    One of the most interesting ideas presented at the show is a car built on a 3-D printer. The German engineering firm EDAG designed the car. The body of the vehicle called "Genesis" is printed in one piece from a material called thermoplastic(热塑性塑料).

    Christoph Horvath is spokesman for EDAG.

    "To create a car without the use of any tool. This would be a real revolution for the industry," said Horvath.

    EDAG says it based its design on a turtle shell. The company says the design provides the right amount of strength and firmness.

    Other automakers did not look so far into the future. Czech automaker Skoda presented its "Vision C" model vehicle. The car has an environmentally friendly natural gas engine.

    Jo Davidson is a company spokeswoman. She says the car releases very low levels of the pollutant gas CO₂. Ms Davidson says the "Vision C" plans to be launched in two years.

China has set new rules limiting the amount of time children can play online games. The rules limit children to just three hours of online game playing a week. That is one hour between 8 p. m. and 9 p. m. on Friday, Saturday and Sunday most weeks. 

Li Zhanguo has two children aged 4 and 8. Even though they do not have smartphones, they enjoy playing online games. Like many other parents. Li is happy with new government rules. But experts say it is unclear if such policies can help prevent addiction to online games. Children might just get addicted to social media instead. In the end, experts say, parents should be the ones to set limits and support good practice. 

There has been a growing concern in China about gaming addiction among children. Government reports in 2018 found that about one in ten Chinese children were addicted to the Internet. The new rules are part of an effort to prevent young people from spending too much time on unhealthy entertainment. That includes what officials call the "irrational fan culture" 

Under the new rules, the responsibility for making sure children play only three hours a day as largely on Chinese gaming companies like Net Ease and Ten cent. Companies have set up real-name registration systems to prevent young users from going past game time limits. They have used facial recognition technology to check their identities. And they have also set up a program that permits people to report what is against the law. It is unclear what punishments gaming companies may face if they do not carry out the policies. And even if such policies are performed, it is also unclear whether they can prevent online addiction. 

A specialist treating Internet addiction expects about 20 percent of children will find ways to break the rules by borrowing accounts of their older relatives and find a way around facial recognition. In his opinion, short-video alps such as Douyin and Kuaishou are also very popular in China. They are not under the same restrictions as games.