The Beijing 2022 Winter Olympics were more than a sporting event. They were also a show for science and technology. They are helping athletes (运动员) become “faster, higher, stronger” and offering you a great game-watching experience（A）________ the help of 5G. Let’s look at some high technologies behind it.

The fastest ice The National Speed Skating Oval is said to have “the fastest ice”, as 12 new Olympic records and one world record were set there. The secret is new ice-making technology. Liquid carbon dioxide (液体二氧化碳) is put under the ice to keep the（B）t________ changes on the ice surface in half a degree. That keeps the ice a level surface and it is easier to skate on.

“Seeing” the wind In events like freestyle skiing and ski jumping, the direction and speed of the wind can have great influence on an athlete’s performance. A Chinese research team developed a system to（C）measure wind. The system uses AI technology. It allows athletes and coaches to “see” wind with real-time data (数据).

High-speed cameras In the speed skating race, athletes can reach speeds of 18 meters per second. To catch every exciting moment, Lie Bao was used for the event. Lie Bao, is a 4K high-definition (高清) camera system developed by China Media Group. （D）It can record speeds of up to 25 meters per second. It closely follows the athletes’ movements and catches different scenes during speed skating.

Drones are like airplanes, only without a pilot. No one without a pilot’s license should be allowed to have one.

Something   bad   or   unexpected   can   happen   when   people   send   up   a self-controlled flying machine like a drone without knowing how to really control it.   Drones can become flyaways, and can be caught up on a jet stream (喷气流) and blown away.   A falling drone can do much damage (损害) to buildings and people.

Though drones can be harmful, they can be very helpful. At a sports event, drones can be used to give the spectators (观众) a view from above or help coaches see how their players are doing. They are also becoming a useful tool for firefighters, helping them find and fight wildfires. Drones can watch secretly on populations of animals in the wild, especially endangered ones. In some faraway places in the world, drones are the fastest way to send medicine to people who are in great need of it.

Some people think drones can only be used by governments to help when needed. Others think that if rules are obeyed, there should be little risk to people and property (财产). Drone makers say drones are exciting new technology and that the future will be controlled by them.

To help more disabled people to find jobs in Guangzhou, Starbucks (星巴克) has opened its first “Silent Café” (咖啡馆) in China where almost half the staff have hearing disabilities.

Fourteen out of the thirty staff members have trouble hearing, and so Starbucks has created a café that doesn’t require customers to say anything—nor the staff to hear anything. “This might be the quietest Starbucks among the over 3, 800 shops on the Chinese mainland,” says Leo Tsoi, Chief Operating Officer of Starbucks, China.

The newly opened “Silent Café” has a special ordering system (系统) where all food and drinks are numbered, letting customers easily write down their order and allowing them to place orders without having to say a word.

Chen Siting, a staff member shares her thoughts about the idea. “We cannot hear you but would like to share a tasty coffee with you,” says Siting. “I believe more people like me could find a job they dream about in the future,” she continues.

Like Siting, Zhu Jieying, has been working at Starbucks for about seven years, making him the master of the first Silent Café. He hopes that Starbucks could open more chances for those who are disabled, and encourage them to prove themselves and to discover more possibilities in life.