Human memory is notoriously (众所周知地) unreliable. Even people with the sharpest facial recognition skills can only remember so much.

It’s tough to quantify how good a person is     1     remembering. No one really knows how many different faces someone can recall, for example, but various estimates tend to hover in the thousands – based on the number of acquaintances a person     2     have.

Machines aren’t limited this way. Give the right computer a massive database of faces, and it can process what it sees – then recognize a face it     3     (tell) to find – with remarkable speed and precision. This skill is     4     supports the enormous promise of facial-recognition software in the 21^st century. It is also what makes contemporary surveillance (监控) systems so scary.

The thing is, machines still have limitations when it comes to facial recognition. And scientists are only just beginning to understand what those constraints are.     5     (figure) out how computers are struggling, researchers at the University of Washington created a massive database of faces – they call it MegaFace – and     6     (test) a variety of facial-recognition algorithms(算法) as they scales up in complexity. The idea was to test the machines on a database that included up to 1 million different images of nearly 7,000 different people – and not just a large database     7     (feature) a relatively small number of different faces, more consistent with what’s been used in other research.

As the databases grew, machine accuracy dipped across the board. Algorithms     8     were right 95% of the time when they were dealing with a 13,000-image database, for example, were accurate about 70% of the time when     9     (face) with 1 million images. That’s still pretty good, says one of the researchers, Ira Kemelmacher-Shlizerman. “Much better than we expected,” she said,

Machines also had difficulty adjusting for people who look a lot alike –either doppelgangers (长相极相似的人), whom the machine would have trouble       10     (identify) as two separate people, or the same person who appeared in different photos at different ages or in different lighting, whom the machine would incorrectly view as separate people.

In a bid to hold a simple, safe and yet splendid Winter Games, the opening ceremony of the Beijing 2022 Winter Olympic Games     1     (be) not lengthy or marked with a large-scale performance. The Olympic cauldron (主火炬) at the snowflake-themed ceremony was small,     2     the flames conveyed significant messages of greener Olympic Games.

The use of     3     (advance) technologies such as artificial intelligence, machine vision, 5G and cloud broadcasting added to the novelty of the opening ceremony. The performances,     4     carried forward the theme of global peace and shared future for humankind, focused on environmental     5     (protect),and human health and physical fitness.

To reduce the carbon footprint of the Winter Games, all the Olympic venues were run on clean energy. For example, about 70 percent of the     6     (material) used in the Games were obtained through renting, including new sporting equipment, furniture in the Olympic village, technical devices. Also, the medal platforms     7       (make) of recyclable and environmentally friendly materials.

More important, thrift, a traditional Chinese virtue, can help build a     8     (health) social environment for China to realize     9     (it) targets of peaking carbon emissions before 2030 and carbon neutrality before 2060.All this made the 2022 Winter Games     10     important Olympics to focus on achieving carbon neutrality.

    1    the Year of the Tiger approaching, all kinds of items     2    (relate)to the Chinese zodiac (生肖) have been selling rapidly.

Since last month,the sales value of goods featuring tiger elements     3    (rise) 9.4 times year-on-year,according to e-commerce platform JD.The popularity of the zodiac illustrates people’s growing     4    (recognize) of traditional Chinese culture,both at home and abroad.

In China,the tiger     5    (know) as the “king of all beasts” and it is     6    symbol of bravery and power.In ancient times,tiger patterns were carved on bronze or golden seals as symbols of military authority.In traditional culture,the tiger was regarded as an auspicious animal       7    drove away evil spirits and brought blessings and peace.

The zodiac element has been applied to almost many consumer goods,     8    (include) hand bags, cosmetics, stationery, snacks—and clothing, of course. On Dec 17,the Nanjing Yunjin research Institution and fashion Teenie Weenie     9    (joint) launched a new series to celebrate the Year of Tiger.A week before the launch,consumers responded positively to a preview,with a large number of resale bookings.After the     10    (office) launch,the series saw sales of 10 million yuan in just two weeks.

The 24th Winter Olympic Games will be open in Beijing on Feb 4,     1    official motto is “Together for a Shared Future”, with the concept of “Green, Inclusive, Open and Clean”

China's successful-bid for the Games have encouraged millions of people     2     (participate) in winter sports since 2018, and ice hockey     3     (strike) a chord with them. A group of young ice hockey players     4     (mark) the 30-day countdown to the Beijing 2022 Winter Olympics by playing a friendly game on New Year's Day in Toronto, Canada. The U-11 kids from the Toronto to Future Stars and Maple Stars,     5       (represent) by players of Chinese and non-Chinese descent(血统)，respectively，received rounds of applause as they showed their hockey skills on the rink(冰场).

Jeanette Han, who organized the event, said     6    was a great opportunity to promote winter sports     7     (exchange) between China and Canada. Shin Li, head coach of the Future Stars, said     8     (play) such a fun game was the best way to welcome the Beijing Olympics.

With interest in winter sports     9     the rise among China, many schools have included snow and ice sport's courses in their curriculum.     10     (hope), ice hockey will be promoted as a major sport in China during the next 10 years.

In 2005, Tanya Pinto, a young businesswoman in the US, paid a visit     1     her birthplace, India. There she traveled and spent three months     2     (volunteer) to do something for children in great need. The experience was life changing.     3     that's why she started Baal Dan Charities, meaning "Helping children."

At first, Baal Dan provided street children with clothes. Later, food, medicine, schoolbooks, and some education     4     (give) to orphanages, schools and local projects. Tanya got first donations(捐赠) from friends and co-workers and today, more people come to her help out of     5     (kind).

It is a great job. At a care center, two boys,     6     Tanya's charity had helped, recognized her and eagerly told her they were doing well after they were rescued from the streets. In the years     7    (come), Tanya hopes to do more. “I will take them to the zoo, the park or for an outing. And I'll do things that are really fun     8     (activity), because I like to bring some fun into their poor life," says Tanya.

What Tanya does is     9     (inspire). If you're not rich or famous, you can still do something to help make     10     better world.

The spending power of young people     1     (vary) from person to person. Each,     2    , is faced with the same question: what to do with their money? Some handle this less well than others. Recent headlines have seen more and more teens maxing out their parents’ credit cards on games or other online activities.

In contrast to these big spenders, there are also teens that prove age is no barrier to making good use of money.     3     the help of her grandmother, eight-year-old Khloe Thompson started making “Kare Bags” for the homeless people in her district. Inside the bags are     4    (necessary) such as toothpaste，soap and socks,     5    (buy) first with her pocket money and then through crowd funding. These items helped to make the lives of poor and homeless people a little bit     6    (easy). On receiving a Kare Bag, one woman said, “You make me feel like a human being.”

For those     7     have no access to courses, help might be at hand thanks to Jerry Witkovsky and his method of using four jars to teach teenagers how to spend their money wisely.

The wider aim of the jars is to encourage teenagers to think more     8     (objective) about money and the things that it can do, so that they grow up     9     (understand), if you like, the value of the     10     (value).

Are you ready for     1     (expensive)film ever made to premiere(首映)in Chinese theaters? It costs much more than its budget.On Sept 30，2021，The Battle at Lake Changjin     2    (release).

The film features a star-studded cast     3     (lead)by three Chinese directors，Chen Kaige，Hark tsui and Dante Lam，and actors including Wu Jing，Duan Yihong and Yiyang Qianxi.

It is reported that the original script features over 130，000 words，making     4     the longest script in Chinese film history.The film depicts     5     the Chinese People’s Volunteer(CPV)soldiers fought     6     (brave)in extreme conditions in a key campaign around Changjin Lake in the Korean Peninsula from Nov 27 to Dec 24，1950，    7     was considered a turning point of the War to Resist US Aggression and Aid Korea(1950-53).

The production team encountered problems while     8     (film)，such as sandstorms，hail and the most unexpected factor：the outbreak of COVID-19.The film was scheduled     9     (shoot)in 2020 but was delayed to early February 2021.

    10     impressed Chen most was the great spirit of the CPV soldiers.For“the hundreds of thousands of Chinese soldiers who died in the War”，said Chen，“It is a tribute(致敬)to them.”

The 2021 (22nd) Hainan Island Carnival kicked off in Haikou, capital city of Hainan province, on Dec 10, 2021.

The Ministry of Culture and Tourism will continue to support Hainan in     1    (deepen) reform and opening up, support Hainan’s aim to become an international tourism consumption center, and provide     2    (assistant) for the construction of Hainan Free Trade Port.

The festival     3    (joint) organized by the Ministry of Culture and Tourism and the People’s Government of Hainan province     4    (become) a vital platform in the past 20 years for Hainan to increase cooperation and exchanges in the fields of tourism, culture and sports     5     the world. This session of Hainan Island Carnival digs deep into all the possible “joyful elements” and fully displays the rich and unique tourism and     6    (culture) resources of Hainan so as to engage both tourists and residents to actively participate and interact in building Hainan Island into     7     joyful destination for visitors around the world.

Apart from the opening ceremony, a series of exciting activities     8    (schedule) to be held during the festival. In terms of tourism, resources of fine scenic spots, rural tourism, and shopping tourism are fully integrated. Seven thematic tourism routes will be launched     9    (attract) more visitors to travel to Hainan,     10     will stimulate tourism consumption and facilitate the construction of an international tourism consumption center.

Researchers have found high levels of looking at a phone or tablet (平板) is linked with around     1     30 percent risk of short-sightedness, also     2     (know) as myopia. when it is combined with excessive (过度的) computer use, that risk rises to around 80 percent.

Staring at a screen continuously for hours     3     (cause) focusing tiredness.     4     (avoid) this, eye experts recommend the “20-20-20 rule” — looking away from your phone or computer screen every 20 minutes and focusing on an object at least 20     5     (foot) (about6.1 meters) away for at least 20 seconds.

Smart phone     6     (blind) happens when people lie on their side at night, with one eye against the pillow and the other staring at the smart phone screen. While one eye gets used to the dark, the other eye has to adjust to the bright light of the high-resolution (高分辨率) screen,     7     might lead to severe problems.

Experts advise users to adjust the color temperature     8     hand. It’s best to use a warm color temperature in dark rooms and a     9     (cold) color temperature in bright rooms. Actually, reducing screen time is     10     (probable) the real key.

An elephant herd     1     fascinated locals and people around the world by making a 500-kilometer trip through southwestern China finally returned home on August 12, also the 10th World Elephant Day.

The elephants traveling from their home in a mountainous area toward the city of Kunming caught     2     (globe) attention. Under the guidance of the leading elephant, the giant creatures explored forests, farms and even a     3     (retire) home. Local governments     4     (lay) food down to keep them away from populated areas. Trucks, drones（无人机）were also used     5     (monitor) the elephants and clean up roads for them to pass safely. Luckily, no other animals or humans were injured.

There are many video clips（视频）on the social media     6     (show) interesting behavior of the animals along their path. In one, two young elephants are being helped out of a ditch（沟渠） by older members of the group and in another, a baby elephant     7     (milk) by its mother.

Asian elephants are among the most highly protected animals in China and     8     drove the elephants to make their long trip is still unknown. “Asian elephants usually won’t leave their home range unless there are major changes to the environment, like a     9     (lose) of habitat linked to agriculture expansion.”    10     official of the World Wildlife Fund said.