3 . Paris is one of the most-visited destinations in the world. A relaxing trip to Paris takes a little bit of planning. Here are some tips for you to make your trip smooth.

Have a passport for international travel. A passport costs $110 and takes 6-8weeks to arrive after you apply.

The cheapest month to fly is March, especially if you can leave on a Monday, Tuesday, or Wednesday. You’ll save even more money by booking around 90 days in advance. In the summer months, tickets will be more expensive no matter when you book.

●Visit the Eiffel Tower

The Eiffel Tower is the most recognizable symbol of Paris. To avoid the crowds, go to the Eiffel Tower early in the morning. It costs €25 to go to the top, or €10 to climb to the first 2 levels on foot.

● See the Notre Dame Cathedral

At present, the Notre Dame Cathedral is closed to tourists due to the fire that destroyed parts of the cathedral. However, you can still visit the outside of the cathedral.

● Go to the Louvre to see world-famous art

The Louvre hosts the Mona Lisa along with 35, 000 other pieces of art. If you’re pressed for time, visit the highlights. The Louvre costs €15 at the museum or €17 in advance (to skip most of the line).

● Take a day trip to Versailles

If you have a day to spare, head to the palace of Versailles, around 14 miles southwest of the city. Take a tour to see King Louis XVI’s palace and gardens. It costs €20 to visit the palace and grounds.

The Yellow River Wetland Park in Yinchuan was once a place local people avoided: raw sewage (污染) caused awful smells     1     almost no grass could grow on the land. It had been several years before this area became a popular destination for locals to take a walk and a habitat frequented by migratory     2     (bird). Now this Wetland Park has appealed     3     many bird photographers.

The Yinchuan Wetland Park     4     (be) a microcosm (缩影) of China’s achievements in wetland protection. Last year seven Chinese cities were awarded “international wetland cities” at     5     14th Meeting of the Conference of the Contracting Parties to the Ramsar Convention on Wetlands (COP14). So far, there are 13 wetland cities in China, showing a great     6     (various)of patterns and styles.

For example, Wuhan, acknowledged as a “city of a hundred lakes”, has five large wetland reserves,     7     tens of thousands of birds come to stay in wintertime.

Liangping district in Chongging, however, is more closely tied to human activity. People built small wetlands in rural areas. What’s more, they have combined these wetlands with organic farms, homestays, and healthcare centers, which     8     (result) in an income increase of 52,000 yuan per household in the past decade.

Panjin in Liaoning province is another surprising wetland city. In the past, the city long suffered from     9     (environment) problems caused by oil production. But now in the coastal wetlands, seagrass turns a breathtaking red every autumn,     10     (create) beautiful “red beaches”.

5 . In 1901, H. G. Wells, an English writer, wrote a book describing a trip to the moon. When the explorers landed on the moon, they discovered that the moon was full of underground cities. They expressed their surprise to the “moon people” they met. In turn, the “moon people” expressed their surprise “Why?” they asked, “are you traveling to outer space when you don’t even use your inner space?”

H. G. Wells could only imagine travel to the moon. In 1969, human beings really did land on the moon. People today know that there are no underground cities on the moon. However, the question that the “moon people” asked is still an interesting one. A growing number of scientists are seriously thinking about it.

Underground systems are already in place. Many cities have underground car parks. In some cities such as Tokyo, Seoul and Montreal, there are large underground shopping areas. The “Chunnel”, a tunnel (隧道) connecting England and France, is now complete.

But what about underground cities? Japan’s Taisei Corporation is designing a network of underground systems, called “Alice Cities”. The designers imagine using surface space for public parks and using underground space for flats, offices, shopping, and so on. A solar dome (太阳能穹顶) would cover the whole city.

Supporters of underground development say that building down rather than building up is a good way to use the earth’s space. The surface, they say, can be used for farms, parks, gardens and wilderness, H. G. Wells’ “moon people” would agree. Would you?

Shennongjia is said to be the place     1     Yan Di once lived. Some visitors hope that they may even encounter the legendary wild men in the remote mountains and virgin (原始状态的) forests. They do not     2     (actual) see any wild man, but they are attracted by Shennongjia’s vibrant (充满生机的) ecology, rich biodiversity and karst landforms.

Shennongjia’s beauty     3     (vary) over the year as nature takes its course.     4     (tourist) can enjoy flower blossoms in spring, be shaded from the summer heat, appreciate red leaves in autumn     5     go skiing in winter. In 2010s, China announced its plan of     6     (build) 10 pilot national parks for ecosystem preservation, including in Shennongjia Forestry District, Hubei Province.

Official data showed that visitors to Shennongjia Forestry District     7     (reach) about 15. 5 million in 2020. By 2025, the forest area aims     8     (increase) that annual figure to over 30 million, with tourism revenue of more than 10 billion yuan.

Visitors can employ a bus service if they do not drive     9     (they) own cars. The journey to Shennongjia will take up to five hours from nearby Yichang or Shiyan. In May, 2021, Shennongjia was connected to     10       newly built freeway, making the mountainous region more accessible.