As the countdown to the 2022 Beijing Winter Olympics continues, the new high-speed railway line    1    （connect）the capital with Olympic host city Zhangjiakou has just entered service. It cuts the travel time    2    the two from three hours to 47 minutes. But this isn’t just another bullet train. This beauty, part of China’s Fuxing series, can run up to 350 kilometers per hour without a driver,    3    （say）to be the world’s first smart high-speed railway.

So what makes them “smart”? Well, the carriages    4    （equip）with 5G signals, intelligent lighting and sensors to collect real-time data and detect any operational abnormalities. Meanwhile, each individual seat has    5    （it）own touch-screen control panel and wireless charging docks. Though the high-speed trains on the route are autonomous,    6    monitoring driver will be on board at all times. The trains can    7    （automatic）start, stop and adjust to the different speed    8    （limit）between stations. Back at the station, robots and facial recognition technologies can help passengers with directions, luggage and paperless check-ins.

Today, China is home to the world’s largest high-speed rail network, and the    9    （fast）commercially operating train—the Shanghai maglev. According to the China State Railway Group, 1,036 Fuxing bullet trains have been put into operation since 2017,    10    the series were first launched.

The British have been drinking tea for over 350 years. But in fact, the history of tea goes much     1    (far) back.

The story of tea begins in China. According to the legend, the Chinese emperor Shen Nung was sitting     2    a tree while his servant boiled drinking water, when some leaves from the tree blew into the water. Shen Nung,     3     expert in herbal medicine, decided to try the water his servant created. As a result, it tasted so good that later the drink was     4     we now call tea.

It is     5    (possible) to know whether there is any truth in this story.     6    , tea drinking certainly was established in China many centuries before it had even been heard of in the west. Containers of tea     7    (find) in tombs dating from the Han dynasty (206BC-220AD) before tea was firmly established as the national drink of China in the Tang dynasty (618-906AD). It became     8     a favorite thing that during the late eighth century, a writer     9    (call) Lu Yu wrote the first book entirely about tea, the Ch’a Ching, or Tea Classic. It was shortly after this that tea was first introduced to Japan, by Japanese Buddhist monks who had travelled to China to study before. Tea drinking has become a vital part of Japanese culture,     10    may be rooted in the sprit described in the Ch’a Ching.