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    This month, Germany's transport minister, Alexander Dobrindt, proposed the first set of rules for autonomous vehicles(自主驾驶车辆). They would define the driver's role in such cars and govern how such cars perform in crashes where lives might be lost.

    The proposal attempts to deal with what some call the “death valley” of autonomous vehicles: the grey area between semi-autonomous and fully driverless cars that could delay the driverless future.

    Dobrindt wants three things: that a car always chooses property(财产) damage over personal injury; that it never distinguishes between humans based on age or race; and that if a human removes his or her hands from the driving wheel — to check email, say — the car's maker is responsible if there is a crash.

    “The change to the road traffic law will permit fully automatic driving,” says Dobrindt. It will put fully driverless cars on an equal legal footing to human drivers, he says.

    Who is responsible for the operation of such vehicles is not clear among car makers, consumers and lawyers. “The liability(法律责任) issue is the biggest one of them all,” says Natasha Merat at the University of Leeds, UK.

    An assumption behind UK insurance for driverless cars, introduced earlier this year, insists that a human “ be watchful and monitoring the road” at every moment.

    But that is not what many people have in mind when thinking of driverless cars. “When you say ‘driverless cars', people expect driverless cars.”Merat says. “You know — no driver.”

    Because of the confusion, Merat thinks some car makers will wait until vehicles can be fully automated without operation.

    Driverless cars may end up being a form of public transport rather than vehicles you own, says Ryan Calo at Stanford University, California. That is happening in the UK and Singapore, where government-provided driverless vehicles are being launched.

    That would go down poorly in the US, however. “The idea that the government would take over driverless cars and treat them as a public good would get absolutely nowhere here,” says Calo.

    As they migrate(迁移), butterflies and moths(飞蛾) choose the winds they want to fly with, and they change their body positions if they start floating in the wrong direction. This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances. Scientists have long thought that insects were simply at the mercy of the wind.

    Fascinating as their skills of flight are, migrating behavior has been difficult to study in insects because many long distant trips happen thousands of feet above ground. Only recently have scientists developed technologies that can detect such little creatures at such great heights.

    To their surprise, though, the insects weren't passive but active travelers on the winds. In autumn, for example, most light winds blew from the east, but the insects somehow sought out ones that carried them south and they positioned themselves to navigate(导航) directly to their wintering homes.

    Even in the spring, when most winds flowed northward, the insects didn't always go with the flow. If breezes weren't blowing in the exact direction they wanted to go, the insects changed their body positions to compensate(抵消). Many migrating birds do the same thing.

    The study also found butterflies and moths actively flew within the air streams that pushed them along. By adding flight speeds to wind speeds, the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour. The findings may have real-world applications.

    With climate warming, migrating insects are growing in number. Knowing how and when these pests move could help when farmers decide when to spray their crops.

    In England, people are fond of sport. In other words, lots of English people like the idea of sport and watch sport on TV. But the number who take part in sport is quite small. On the whole, English people prefer to be fat rather than be thin.

    The most popular sport in England is football. Football is played on Saturday afternoon in most towns and the supporters of a certain team will travel from one end of the country to the other to see their team play. There are four divisions(级别) of the football league. Not surprisingly the best teams are in the first division. But the best supporters are often in the fourth division. You have to be a good supporter to watch the fourth division football!

    Many other sports are also played in England, such as golf, in which you try to knock a ball into a hole; basketball, in which you try to get a ball through a net; tennis, in which you try to hit a ball so that your opponent(对手) can not hit it. As you see, if the ball had not been invented, there would have been no sport.

    Actually, that is not quite true. Athletics(田径) isn't played with a ball, nor horse-racing. Perhaps that is why they are not as popular as football!

    Why do so many tourists come to Easter Island? Because it has world-famous stone statues (雕像) . These statues, whose likenesses look like humans with huge stone cylinders（柱状物）balancing on their heads like hats, have tourists coming from all over the world. The tourists come to see these works of ancient art carved by the early inhabitants of the island. They come to see the mystery that has puzzled historians for decades.

    Easter Island is located in a remote part Of the South Pacific Ocean about 2,300 miles west of Chile. Easter Island covers just 45 square miles and its Polynesian name is Rapa Nui.

    On Easter Sunday 1722, a Dutch explorer named Jacob Roggeveen was the first European to see Easter Island. The early Polynesians carved the statues within the holes of the volcano (火山) using only stone tools. Then they moved these huge statues to various destinations throughout the island. These 600 statues range in height from 10 to 40 feet. Some of them weigh as much as 50 tons. How could the early Polynesians lift hundreds of heavy statues out of the volcano? How did they move them across the island to their various locations? All of these questions, as well as many others, remain unanswered.

    The early islanders probably worshiped (崇拜) these eyeless giants until sometime around 1670. In 1680, a war broke out between two groups of islanders. The victors（胜利者）of the war and ancestors of the present inhabitants, broke down many of the statues. In most cases, they broke the necks of the statues.

    Now 15 of the statues on Easter Island have been repaired to their original positions on their stone platforms. Even today, using modern tools and machinery, putting up such large statues and balancing cylinders on top of their heads presents a challenging task.

    No trip to Windsor could possibly be complete without a visit to amazing Windsor Castle, the family home to British kings and queens for over 1,000 years. The size of the Castle is breath-taking. In fact, it is the largest and oldest occupied Castle in the world and it's where Her Majesty The Queen chooses to spend most of her private weekends. You might even time your visit when she is in residence! The marriage of Prince Harry and Ms Meghan Markle took place in Windsor on Saturday, 19 May, 2018.They became the sixteenth royal couple to celebrate their marriage at Windsor Castle since 1863. Windsor Castle offers something for everyone with so many areas to explore.

    Visit the magnificent State Apartments, furnished with some of the finest works of art from the Royal Collection, including paintings by Rembrandt, Rubens and Canaletto.

    Take in the splendor of St George's Chapel, location of the wedding of Prince Harry and Ms Meghan Markle, the burial place of 10 Kings including Henry VIII and Charles I, and one of the finest examples of Gothic architecture in England.

    Be amazed at Queen Mary's Dolls' House, the largest, most beautiful and most famous dolls' house in the world, created in the 1920s and filled with thousands of objects made by leading craftsmen, artists and designers of the time.

    Imagine being entertained by royalty in the Semi-State Rooms, the spectacular private apartments open to visitors from September to March each year. Richly decorated, they are used by The Queen for hosting her guests.

    When a terrible earthquake hit, many people were killed and many houses fell down. After the earthquake, all the newspapers reported many stories about some of the families who were in trouble.

    One Sunday, when I was reading a newspaper, a special picture touched me. It gave the clothing sizes of each family member. I thought that this would be a good chance to teach my children to help those who were less lucky than ourselves. I said to my seven-year-old twins, Brad and Brett, and three-year-old Meghan. "We have so much, and these poor people now have nothing. We'll share what we have with them."

    I filled a box with foods and clothes. While I was doing this, I encouraged the boys to choose their toys and donate some of their less favorite things. Meghan watched quietly as the boys took out their old toys and games and put them together. Then she walked away. A few minutes later she came back with Lucy, her much-loved doll. She put the doll on top of the other toys. "Oh, dear," I said. "You don't have to give Lucy. You love her so much." Meghan said, "Lucy makes me happy, Mommy. Maybe she'll make another little girl happy, too."

    I looked at Meghan for a long moment. She taught me a lesson. It's easy to give something that we don't want any more, but harder to give what we cherish (珍爱), isn't it?