6 . It's   been a decade since the launch of Airbnb and Uber, now considered a part of life for many people booking trips and journeys. In that time, several boat sharing apps have been working hard to regulate how people rent boats or book activities on the water.

Many of them have a similar business model to Airbnb, where customers rent boats directly from owners. GetMyBoat is the market leader with over 130,000 boats. The founders had the idea when they were sailing in the Atlantic and noticed that large numbers of boats were unused.

The company has grown from having a presence primarily in the lop boating cities in the US to having boats available in 9 ,300 destinations across 184 countries. Since it first started, GetMyBoat has sent over 120,000 people out boating. This year, it is projecting to send 65 ,000 people out on the water, a dramatic increase from the 53 people who booked a boat in its first year back in 2013.

US competitors include Boatsetter, which has 25 ,000 boats available across the world. Parisian- based Click&Boal has 30,000 boats globally and in the Mediterranean, Samboat is a major player with 25 ,000 boats.

It's an obvious win for boat owners who are looking for ways to minimize （使最小化）the cost of owning a boat by renting it out. And modern technology means that the boat can find nearby customers without being registered to a specific boating agency as in the past.

Safety issues are very important. Boatbound failed after a customer lost a leg in an accident because the company didn't require that people hire captains with the boats, something that its competitors do.

The market is changing in that fewer people are seeking to buy their own boats, while the number of people who want to experience boating is growing. This new market is allowing people to search for and book water experiences that offer something new.

A group of students from England, who are interested in archaeology, have come to the Zhoukoudian caves for a visit. An archaeologist     1     (warm) gives them a brief introduction     2     the life and habits of the earliest people there.

Early people lived in caves and they made fires in the centre of caves     3     (keep) themselves warm, cook the food and scare their enemies away, such as tigers and bears. They might have kept the fire burning all winter because layers of ash almost six metres thick have been excavated.

Early people did wear clothes made from animal skins. They used sharpened stone     4     (tool) to cut up animals and remove their skins. Smaller scrapers     5     (use) to remove the fat and meat from the skin. Finally using needles     6     (make) of animal bones, they would sew the pieces together.

Early people also paid attention to their     7     (appear) and wore necklaces. Some of the necklace beads were made of animal bones but some were made of shells,     8     told us that all the fields around Zhoukoudian caves used to be part of     9     large shallow lake. They moved around, following the herds of animals. They didn’t grow their own crops, but picked fruit when it     10     (ripen) and hunted animals.

8 . Tourism probably started in Roman times, Rich Romans visited friends and family who were working in another part of the Roman Empire. But when the Empire broke down, this kind of tourism stopped.

In the early 17th century, the idea of the “Grand Tour” was born. Rich young English people sailed across the English Channel. They visited the most beautiful and important European cities of the time, including Paris in France, and Rome and Venice in Italy. Their tours lasted for two to four years, and the tourists stayed a few weeks or months in each city. The “Grand Tour” was an important part of young people’s education—but only for the rich.

In the 18th century, tourism began to change. For example, people in the UK started to visit some towns, such as Bath to “take the waters”. They believed that the water there was good for their health. So large and expensive hotels were built in these towns.

In the 19th century, travel became much more popular and faster. When the first railways were built in the 1820s, it was easier for people to travel between towns, so they started to go for holidays by the sea. And some started to have holidays in the countryside as cities became larger, noisier and dirtier.

Traveling by sea also became faster and safer when the first steamships were built. People began to travel more to far-away countries.

The 20th century saw cars become more and more popular among ordinary people. Planes were made larger, so ticket prices dropped and more people used them. Thus tourism grew. In 1949, Russian journalist Vladimir Raitz started a company called Horizon Holidays. The company organizes everything—plane tickets, hotel rooms, even food—and tourists pay for it all before they leave home. The package tour and modern tourist industry was born.

The first travel agency in China was set up as early as 1949. But tourism did not take off until 1978. In 2002, the industry was worth 500 billion yuan and became an important part of China’s social development.

10 . From the earliest times,man has been interested in art.People have often worked together to collect and save the world’s art treasures.

Fine art treasures from many countries are kept in an art museum called the Louvre(卢浮宫)in Paris,France.The works of art have been collected by the people of France over many centuries.It is the biggest art museum in the world.

The Louvre has not always been a museum.The first building was a fort (堡垒).In 1190,it was the king’s castle with high walls and a round tower.It had a moat(护城河) to keep out the enemies.

Over the years,the number of buildings around the castle grew.By 1350,the castle was no longer needed as a fort.The Louvre became a palace home for French kings and queens.

During times of peace,new treasures were brought in.During days of war,many treasures were stolen,and the buildings were damaged.

When Francis Ⅰ became king of France in 1515,he brought in many artists from other countries.One of the artists was Leonardo da Vinci from Italy.Da Vinci’s MonaLisa is the best known painting in the museum today.

In 1793,the Louvre became a public museum,just as it is now.It is a place where art treasures are kept for everyone to enjoy.Every year millions of people from all over the world come to the Louvre to see the masterpieces.