According to a 2006 Danish study published in the Psychonomic Bulletin &Review, people over age 40 perceive themselves to be, on average, 20 percent younger than     1     their ID indicates. Why do some of us feel that the number of candles on our birthday cake can't be right? Psychologists and scientists    2    (study) this phenomenon since the 1970s. Some wonder about the cultural factors that push us to look younger because old age is often associated     3    being unproductive and dependent. Other factors that lead to us perceiving ourselves as younger are being sociable and having intergenerational relationships.

By analyzing large amounts of data, Al learns and     1     (improve) with each new task it performs. This has led to a sharp rise in its use in many fields, including healthcare, transportation, and even education. In the healthcare industry, AI     2     (use) to diagnose diseases and design drugs. Another area     3     AI is making an impact is in transportation. Autonomous vehicles,     4     (power) by machine learning algorithms, are becoming more common on the roads.

I had an experience that I will forever bear in my mind. Once upon a time, as I was swimming in a lake, I suddenly felt a sharp sting in my leg. When    1    (look) down, I realized that it was a snake! I was so frightened that I swam fast     2    (avoid) it. Then I remembered what I had learned about dealing with snakebites. I immediately pressed against the wound and swam to the shore for help.    3    (lucky), I was sent to the hospital in time.

After graduating from the university     1     a bachelor’s degree in biotechnology in 2020, Jiang Ming started work as a keeper at the forest zoo, which is home to more than 3, 000 animals from 260 species.

Born and raised in a rural area of Jiangsu, he     2     (love) animals and watched documentaries about them since childhood.

During his job interview at the zoo, when Jiang was asked     3     he had any experience in saving animals, he said the first one he     4     (help) rescue was a small turtle his father found in a river near his village.

Shadow puppetry, also called “yingzixi”,     1     (consider) to be a predecessor (前身) of the movie and had existed in China for centuries.

As for the origin, shadow puppetry can date back to the Han Dynasty. Once Emperor Liu Che lost his beloved wife Li due to a deadly disease. Much     2     (sorrow) about her death, he even ignored the state affairs,     3     worried his officials quite a lot.

But unfortunately, the ancient art gradually fell due to the impact of modern audio-visual media like television and movies.

China is likely to become the first country     1     (bring) Martian soil back to Earth in an ambitious science and engineering endeavor, according to a top space scientist.

Wu Weiren, an academician at the Chinese Academy of Engineering and a     2     (lead) scientist at the China National Space Administration, said that the nation plans to collect Martian samples and then bring them back to Earth around 2030 via a historic mission     3     (name) Tianwen 3, the third in China's interplanetary exploration schedule.

When Halloween arrives, you know there is bound to be some mischief (恶作剧). So I wasn’t     1     (entire) surprised when I opened my front door that night to see my candy bowl completely—and very suddenly—empty. To be fair, this was after some light rain    2     (clear) the street of most trick-or-treaters and the youngest had already made the rounds. I never saw    3     took it, but I did shout “Happy Halloween!” into the night air.

When we’re solving a complicated problem, we often gather a group    1     (brainstorm). We’re looking to get the best ideas as quickly as possible. I love seeing it happen—except for one tiny wrinkle. Group brainstorming usually backfires.

Extensive evidence shows that when we generate    2     (idea) together, we’re unlikely to maximize collective intelligence. As the humourist John Smith said, “If you had to identify, in one word, the reason    3    the human race has not achieved, and never will achieve, its full potential, that word would be：‘meetings’. ” But the problem isn’t meetings    4     (they)—it’s how we run them.

Connected to each other like never before, young people today are becoming agents of change, increasingly     1    (contribute) to innovative solutions that improve people’s lives and the planet’s health.

The United Nations Institute for Training and Research     2     (be) therefore delighted to launch the Young Leaders Online Training Programme, a four-week e-Learning course, to provide participants     3     the knowledge and skills to fully unfold their potential as global leaders.

A parent’s nightmare turned to relief in Florida as policemen swiftly rescued a missing five-year-old girl with autism. The local police launched a desperate search,     1     (use) air and ground efforts. Thermal imaging (热成像)    2     (lead) to the discovery of her in a swampy area. A body-worn camera captured the heroic moment of her rescue.     3     policemen’s quick response, she was found unharmed. The public praised the team’s efficiency in turning     4     could have been a tragedy into a heartwarming reunion.