【推荐2】As space science develops, man has learned more and more about space. Space is not only amazing but also dangerous. While working in space, spacemen are facing danger as well as success.

Scientists have found out that the radiation (辐射) is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of the radiation from the sun and other stars, which s bad for their health. The harm of the radiation won’t be found until their children even grandchildren are born. Some special medicine may work a little, but no really effective medicine has been found so far.

Space rubbish is also thought to be great danger to spacemen. It’s reported that there were 9,000 man-made things flying in space. About 30% of these are satellites, 10% are spaceships, and the rest are space rubbish. An explosion (爆炸) in space in 1999 made a cloud of 300, 000 fragments (碎片), each at least 4mm in size. A small piece of these even knocked a spaceship window and caused some damage (损坏).

Scientists are watching and reporting any possible danger all the time. They are working to deal with space rubbish. Although space is really dangerous, it interests many people on the earth, In the near future, it may become possible for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space in a few years. So we should do something to help improve the space environment.

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Hangzhou, together with five other cities in Zhejiang, has successfully hosted the 19th Asian Games from Sept 23, 2023 to Oct 8, 2023. The Games were thought “smart” with the use of many exciting technologies.     1    !

The venue (场地) for the tennis finals of the Hangzhou Asian Games is sometimes called the “Small Lotus”.     2    . These petals can open and close freely though each of them weighs 160 tons. It’s built this way for different kinds of weather.

    3    ? When the athletes needed first aid, drones (无人机) were used to send things over. They could fly as far as 20 kilometers and travel 16 meters in one second. Using a drone saved about 60 percent of the time.

If you are in Hangzhou and going to visit the venue, it will be sad if you can’t find your way. AR is here to help. There is a mini program that provides us with AR service. You simply turn on your phone’s camera and     4    . You can also get more information about the venue as you walk by.

Technology made the 19th Asian Games very smart and convenient.     5    . We hope we can see more “smart” games in the future.

The summer is coming, and storms (暴风雨) often happen. Though they often happen, some people don't take them seriously (认真地). In fact, it's very dangerous for people and it can even make people die at once.

So how do we keep safe during a lightning storm (雷暴)?

If you are indoors, stay away from windows and doors during a lightning storm. Don't take a shower or do any dishes, because lightning can travel through water. Turn off the TV and computer. I learnt that in a hard way, and my computer was broken. Never use the phone. Lightning can travel through the phone line and hit you.

If you are outdoors during a lightning storm, never take shelter (避雨) under a tree, because the lightning can hit the tree and travel through the tree to hit you. Stay away from anything that is metal (金属). Try to get into your car and close all the windows or go into a nearby building right away. If there's no building around, try to find a low place to stay in.Squatdown near the ground and put your hands over your ears. Never use a cell phone.

【推荐2】Most people in Britain live in small family groups. More than a quarter of homes in Britain have only one person living in them. Some of these persons are old but some are of twenty to thirty who choose to live alone. 35% of homes have two people living in them, and another 17% have three people. 15% have four people living in them, and the other homes have five or more.

The families in Britain are small. It is unusual for parents to have more than two children. When children are about eighteen or nineteen, they leave their parents’ home, and they often go to other cities. Sometimes they only visit their parents two or three times a year.

Around the world,facial recognition（FR人脸识别）has slowly become a part of our daily life.

After helping people to make payments and open bank accounts,FR now is used in the subway of Zhengzhou,Henan Province. FR was introduced in September and now it can be used by passengers who link their online payment systems to the subway's smartphone app. China Daily reports that other cities in China,including Beijing,are testing a similar system.

It's not hard to see why. FR technology could help speed up security （安全） checks greatly. Yuan Xiaoqin,a park manager in Hangzhou,told CCTV the reason why the park upgraded （升级） its entry system,"FR can help a visitor enter the park in two or three seconds. Fingerprint information sometimes isn't sensitive （灵敏的）,especially when the fingers are injured or too dry." Before,the park used a fingerprint entry system.

However,there are some problems with the use of FR. Some people are afraid that their personal information will be leaked.

In fact,sometimes people can refuse the app if they don't want their facial information disclosed （暴露）,but sometimes people don't have a choice.