阅读理解

AVOID PUBLIC WI-FI

    Free Wi-fi offered in public places is often poorly secured. Hackers need only ordinary tools to access mobile phones linked to the network and the information the devices store.

DON'T OVERSHARE ONLINE

    Internet users can let their guard down when chatting with strangers on social media, letting slip their names, family details, workplace addresses and job titles to their new “friends”. Some parents even share photos of their children online, forgetting to hide details that can disclose their names, schools or where they live.

AVOID ONLINE SURVEYS

    Some questionnaires try to attract people with small rewards or a chance to take part in a “lucky draw”. But to qualify, people must fill in their names, phone numbers and home addresses. Check the website where the survey is being hosted and consider whether it's reliable.

KEEP ONLINE RESUMES BRIEF

    Internet users often do not hesitate to provide detailed personal information in their online resumes, thinking it can only help probable employers to contact them. Some job site operators even require applicants to list their family members' information. China's Ministry of Public Security says people should give only the information necessary.

TRACK COPIES OF YOUR ID CARD

    Banks, telecommunications operators and other service providers often require photocopies of your identity cards to open accounts or perform other business. Dishonest employees might then try to sell them to scammers (骗子).

    A bookseller in Chongqing has been leaving novels on trains and at stations to inspire more commuters(上下班往返的人)to read, after seeing British actress Emma Watson take part in a similar project in London.

    Author and bookstore owner Jiang Lin, 29, randomly placed 40 works along the city's light-rail system on Sunday. Whoever finds a book can read it in public or take it home, but they are encouraged to leave it again on public transportation once they have finished with it. Jiang said, “I considered the needs of commuters," he said. "I hope strangers can feel comforted by the books and feel connected with other readers."

    All 40 books were chosen from Jiang's store, Razor's Edge Book Club, which he opened in the summer, and included fiction and nonfiction, with topics ranging from art and social sciences to philosophy and history Jiang's Books on the Chongqing Light Rail project follows the same model as Books on the Underground, which was started in 2012 and sees “book fairies” leave works on London Tube trains and at stations. Readers are encouraged to share their views on the books. It was revealed on Nov. 1 that Watson, who is best-known for the Harry Potter movie series, is a book fairy.

    “After I read the news about her leaving books on the London Tube, I was so inspired that I immediately decided to do something over the weekend,” Jiang said. However, his decision was so spontaneous that he had no time to make the stickers that are usually placed on each book to identify them as part of the project . Instead, he put a note on the fly page to introduce the concept.

    To his surprise, one of his friends was among those who found his books and posted a picture on WeChat Moments, a social media function on the instant-messaging app. Jiang said more than 20 people have since come onboard and are now working on a more detailed than to spread the love of reading. Although increasing numbers of people read on digital devices, books have not totally gone out of fashion. Jiang mentioned that they needed the support from Chonqing Light Rail Co. to ensure the books to stay there and also hoped the project could be welcomed across the country.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    The Israeli farmers who pioneered the revolutionary technology known as drip irrigation weren't trying to solve one of the world's most urgent problems．They were just trying to survive．They lived in the desert，and they didn't have enough water to grow their crops．

    In its simplest form, it was little more than a pipe with holes in it. But behind each hole was a hi-tech dripper that let out just the right amount of water. Snaked along a row of crops so that the holes were positioned directly above the roots, the pipe could direct each precious drop of water directly to the plants, getting a bigger harvest while using a very small amount of the water．

    Over time, the farmers improved upon the technology, perfecting the drippers that regulated the flow of water, and connecting the pipelines to computers that could determine exactly how much water each plant needed and when．

    If the global population kept growing, the rest of the world would increasingly resemble their little community in the desert. So they began selling their irrigation systems in other parts of the world，eventually expanding to more than 110 countries. Netafirm, the company says it's lifting people out of poverty and conserving water at a time when the importance of doing so has never been clearer．

    The mass adoption of drip irrigation won't save the world by itself. To avoid the coming catastrophe, nearly everybody will, in some way, have to do more with less, perhaps through accepting and using other new technologies. Otherwise, it's going to get ugly．

    Parents who help their children with homework may actually be bringing down their school grades. Other forms of parental involvement, including volunteering at school and observing a child's class, also fail to help, according to the most recent study on the topic.

    The findings challenge a key principle of modern parenting where schools expect them to act as partners in their children's education. Previous generations concentrated on getting children to school on time, fed, dressed and ready to learn.

    Keith Robinson, the author of the study, said, "I really don't know if the public is ready for this but there are some ways parents can be involved in their kids' education that leads to declines in their academic performance. One of the things that was consistently negative was their parents' help with homework." Robinson suggested that may be because parents themselves struggle to understand the tasks."They may either not remember the material their kids are studying now, or in some cases never learnt it themselves, but they're still offering advice.

    Robinson assessed parental involvement performance and found one of the most damaging things a parent could do was to punish their children for poor marks. In general, about 20% of parental involvement was positive, about 45% negative and the rest statistically insignificant.

    Common sense suggests it was a good thing for parents to get involved because "children with good academic success do have involved parents", admitted Robinson. But he argued that this did not prove parental involvement was the root cause of that success. "A big surprise was that Asian-American parents whose kids are doing so well in school hardly involved. They took a more reasonable approach, conveying to their children how success at school could improve their lives."

    Cold weather during winter months may keep many people from leaving home and running in the open air.

    However, a new study shows that the drop in temperature is a good reason to run. In fact, researchers say, running in cold weather helps improve one's performance.

    Many people say running in the winter can be difficult. Two reasons are the low temperatures and bitter winds. Yet many runners might find it easier than running in hot weather.

    That could be because lower temperatures reduce stress on the body. When you run in cold weather, your heart rate and the body's dehydration (脱水) levels are lower than in warmer conditions. The body needs less water on a cold day than in warm weather.

    This information comes from sports scientists at St. Mary's University in London. John Brewer is a professor of applied sport science at St. Mary's.

    For this study, he and other researchers put a group of people into a room they called an “environmental chamber.” The researchers then recreated summer and winter weather conditions in the room. The test subjects were asked to run 10,000 meters under both conditions. Brewer says he and his team recorded biological measurements of the runners.

    “We've got a group of subjects into the environmental chamber, we've changed the conditions to replicate the summer or winter and we've got them to run a 10km under both of those conditions and taken various measurements on each runner while they've been completing their 10km.”

    Brewer says every movement runners make produces heat. He explains that one way in which we lose heat is by sweating. The body loses heat through droplets of sweat. He says the body also loses heat by transporting the blood to the surface of the skin.

    It seems we're always being told to get more sleep. Studies suggest spending less time on sleep can lead to obesity(肥胖) and even cancer. You might even find yourself with a head full of false memories. But rarely does science explore the dark side of sleeping too much. That's because few of us in today's busy world have the luck of exploring that option.

    In an August 2018 study, published in the Journal of the American Heart Association, researchers researched the sleep patterns of those "fortunate" few and found they may not be so lucky after all. In fact, they found people who get more than eight hours of sleep have greater health risk compared to those who sleep together less than seven hours. What's more, sleep-aholics-those who manage to get 10 hours a night-stand a 30 percent higher chance of dying compared to the seven-hour crowd.

    The wide-ranging global study involved(涉及) more than three million people who self-reported on their sleep habits and came to an eye-opening conclusion: If you tend to sleep a lot, you may want to buy an alarm clock. As with all things in life, sleep is best taken in moderation(适度).

    You may be thinking: What if I only sleep in on Saturday and Sunday, am I still at risk? The answer is yes, according to a 2019 study published in Current Biology.  Researchers discovered that even if a person sleeps more than seven hours on the weekends but still sleeps less than that on weeknights, they are at risk of gaining weight and developing sensitivity to insulin, which controls the level of sugar in blood.

    For the study, 36 participants were divided into three groups that each had a different sleep schedule: nine hours every night, five hours every night, and five hours from Monday to Friday and sleeping much on weekends. People who get too much sleep tend to feel tired and lack energy. Also, both sleep-deprived(睡眠不足的) groups consume more food and gain weight.