The Dujiangyan is the oldest man-made water system in the world, and a wonder in the development of Chinese agriculture.     1     （build）over 2,200 years ago in what is now Sichuan Province in Southwest China, this amazing engineering     2    （achieve）is still used today.

In ancient times, the region where Dujiangyan now stands     3    （suffer）from regular floods from the Minjiang River.     4    （help）the victims of the flooding, Li Bing,     5     region governor, together with his son, decided to find a solution. Li designed a series of channels built at different levels along Mount Yulei that would take away the floodwaters while leaving the river flowing naturally.     6    （good）still, the extra water could be directed to the dry Chengdu Plain, making     7     suitable for farming.

Once the system     8    （finish）, no more floods happened and the people were able to live     9    （peaceful）. Today, Dujiangyan is admired by scientists from around the world because of one feature. Unlike modern dams,     10     the water is blocked with a huge wall, Dujiangyan still lets waterflow through the Minjiang River naturally, making the ecosystem（生态系统）and fish populations exist in peace.

China’s Liangzhu Archaeological Site     1    (declare) on the list of World Heritage sites on Saturday by UNESCO’s World Heritage Committee during its 43^rd session in Baku, the capital of Azerbaijan.

The site,     2    is located in Yuhang District in Hangzhou City in China’s eastern Zhejiang Province, showcases the civilization of prehistoric rice agriculture between 3,300 B.C.     3     2,300 B.C. The ruins of ancient Liangzhu city were discovered in 2007, and then large dam sites     4    (surround) the Liangzhu ancient city were unearthed continuously after 2009. It was     5     (official) submitted to UNESCO in 2019, hoping to win     6     (recognize) as a World Cultural Heritage Site. The site     7     (include) archaeological remains and unearthed cultural relics of the Liangzhu Ancient City as well as a wetland that covers     8     area of 908. 89 hectares in a plain river network. It is also found that the Liangzhu ancestors started to use characters about 5 ,000 years ago, 1 ,000 years     9     (early) than previously thought, according to Colin Renfrew, a retired professor of archaeology at the University of Cambridge.

The World Heritage Committee added Liangzhu to the UNESCO list    10     (encourage) better protection of the site, considered to be of “outstanding universal value” to humanity.

In 1972, UNESCO started a programme to protect the world’s cultural and     1    (nature) heritage. Since then, more than 800 cultural sites     2     (add) to the World Cultural Heritage Site List. The Taj Mahal (泰姬陵) in India and the Imperial Tombs of the Qing and Ming Dynasties in China    3     (be) two of the best known examples.

The Taj Mahal built between 1631 and 1648, is a masterpiece of architecture. It took more than 20, 000 workers and 1,000 elephants    4     (complete) the project, and the stones came from as far away as China.

    5    makes the Qing and Ming Tombs unique is that they bring together architecture and philosophy.     6     (build) by several emperors between 1368 and 1915, the Tombs represent Chinese cultural and historical    7     (value) that have been handed down from generation to generation for thousands of years.

Human life     8     (last) only a short time but art and culture last forever. The programme attempts to protect and preserve     9     best of human history. Masterpieces such as the Taj Mahal and the Imperial Tombs remind us     10    what we can achieve at our finest, and inspire us to live up to our great past in the future.

The Temple of Heaven Park, Tiantan in Chinese, is located in the Dongcheng District, Beijing. It is the     1    (large) and most representative existing masterpiece among China's ancient sacrificial buildings.     2    (original), the Temple of Heaven was the place where emperors of the Ming Dynasty and Qing Dynasty held the Heaven Worship Ceremony. First     3    (build) in 1420, the 18th year of the reign of Emperor Yongle of the Ming Dynasty, the Temple of Heaven was enlarged and rebuilt during the reigns of the Ming emperor Jiajing and the Qing emperor Qianlong. In 1988, it     4    (open) to the public as a park, showing ancient philosophy, history and religion. Its grand architectural style and profound cultural implication give     5     insight into the practices of the ancient Eastern civilization.

Covering an area of 2,700,000 square meters, it is larger than the Forbidden City,     6     is enclosed by a long wall.     7    (it) northern part within the wall is semicircular symbolizing the heavens and the southern part is square symbolizing the earth,     8    (reflect) an ancient Chinese thought of “the heaven is round and the earth is square”. The main buildings lie     9     the south and north ends of the middle axis of the inner part. The     10    (significant) is the Circular Mound Altar (Huanqiutan) to hold many ceremonies.

I wake up to the sound of the wind buffeting the cloth of my tent. Even though the sun is    1    (bright) shining, telling whether it is morning or night is impossible. I’m above the Arctic Circle,    2    in summer the sun never sets. I’m in the remote far north of Sweden in Sarek National Park,    3    place with no roads or towns.

Around 9,000 years ago, reindeer began to arrive at Sarek’s mountains. Following the reindeer    4    (be) the Sami people, who made this territory their home. In 1909, Sarek was made a national park    5    (keep) the land in its natural state.

For hundreds of years,    6    (look) after reindeer was a way of life for the Sami. Today, most Sami have houses in villages near Sarek and live a modern life just    7    their neighbours and enjoy their    8    (tradition) as before.

After breakfast, I pack my bag and set out again. Being in such a    9    (beauty) and wild place makes me feel    10    (bless) to be alive.

8 . When you think of the Arctic, you imagine an icy land of pure white snow, which is considered to be the last really clean place     1    (leave) on Earth. Yet plastic trash has now reached the remote regions of the Arctic and the Alps. A team of     2    (scientist) has discovered large quantities of microplastics(微塑料) — very small pieces of plastic waste — in the Arctic snow. While microplastics have been found in sea-water, drinking water, and even in animals over     3     past several years, this is the first study to show microplastics in snow,     4     indicates it is an airborne pollutant that must be paid attention to. 

The researchers state that microplastics in snow suggest that microplastics may be in the air that we     5    (breath). Therefore, it is really important     6    (assess) if microplastics also reach lung tissues.

Previous research has found that they flow over long distances and into our oceans,     7    (damage) ecosystems along the way. They start in our wastewater, when we wash clothes     8     plastic fibers. The wastewater then flows into rivers and out to sea, where they     9    (eat) by sea animals. If people then eat these animals, it means that we’re     10    (probable) eating the plastic as well.