3D printing has several advantages     1     traditional manufacturing techniques. Building a model would be very expensive     2    (use) traditional manufacturing methods. You have to spend thousands or more to set up machine tools and then thousands more when you want to change that model. 3D printing makes it financially    3    (afford) to build one-off models. Making simple     4     (repair) to old household appliances, rather than replacing them, also becomes possible when spare parts can be printed off in your living room, rather than having to be tracked down and     5     (order) online. Using a 3D printer also cuts down the supply chain: the network of factories, warehouses and shipping companies normally needed to get a product to    6     end user.

But 3D printing also has its disadvantage. In general, 3D printers are slow. A two-inch-high figurine can take about one hour to print.     7     , consumer-grade 3D printers are only able to produce relatively simple plastic models.

Last but not least, 3D printing is facing legal challenges. Established players in manufacturing argue that their intellectual property is ripped off by home printers. Currently, the copyright laws are     8     (clear) about the degree to     9    3D designs and software are protectable, and what     10     (consider) violation.

With so much food waste going to rot in landfills, a company     1    (call) Veles . wanted to repurpose those sugars and acids and turn them into something useful. Today, their all-purpose cleaner is made from food waste, along with a selection of     2    (natural) sourced fragrances — and lab tests show it to be effective 99% of the time at cleaning tough dirt from multiple     3     (surface).

The environmental benefits of the Veles cleaner go beyond just     4     (increase) the amount of food waste being recycled. It raises awareness of the benefits of bio-matter as a cleaning agent;     5    (reduce) a source of methane, a harmful greenhouse gas,     6     comes from food waste accumulating in landfills; and also removes the need for processed ingredients (原料)     7    (ship) to the Veles production facility from faraway places.

And more good news comes from the fact     8     they've designed their handsome spray bottle to be made of recyclable aluminum, and the company will soon be selling refills for it.

Like other products that are     9    (benefit) for the environment, Veles isn't cheap. It is available for $16. 00 on their website, but the refills will be selling for half     10     much— for all the customers who want to maximize the green potential of their dollars, and support small business innovation.

Nowadays, face masks are being worn all over the world, but China is one of first countries to realize the     1    (important) of the wearing of face masks. In fact, it is also a result of traditional cultural factors in China.

These include the beliefs     2    (root) in traditional Chinese medicine, of     3     qi is a hugely important concept. The Chinese character for qi is related to air, breathing, and energy. People believe that     4     one is low on qi, they are more likely to fall ill. Thus,     5    (maintain) a supply of clean air in one's lungs is important. Because face masks can filter out     6    (poison) matter in the air, people tend to consider them a useful tool for disease     7    (prevent).

Some experts argue that effectiveness of face masks in preventing disease is great. According to Dr. Deng Xiaofan, a medical advisor, face masks can actually prevent the spread of     8    (virus) on condition that they are worm correctly. Other experts have pointed out that healthy people do not need to be     9    (constant) wearing them when not in public. When it comes to preventing COVID-19, authorities advise correct face masks wearing and frequent hand washing     10     effective ways of controlling the spread of diseases.

Whether you're working hard to be like Wordsworth     1    you've yet to uncover the literary prowess(非凡的技能)within you, it is hard to ignore just how much of a role poetry     2    (play) in the development of both written and spoken language so far. When you're studying a new language it only makes sense that you shouldn't only stick to boring old prose(散文)．Foreign language poetry is     3     fantastic resource for learners of all levels.

Poetry allows writers     4     (toy) with the standards of grammar and generally change the rules of language a bit or a lot. You can learn a great deal about a language by the ways its speakers have turned its syllables(音节)and words     5     lines.

Poetry comes in a     6    (vary) of genes (体裁)and structures, so generalizing about it is sort of unfair to the art form itself. But there are certain universal     7     (aspect) of poetry that make it an idea tool for leaning a new language in creative ways across languages.

Perhaps the most notable difference     8    set a poem apart is that it's often not as long-winded as a passage from a book might be. It's much     9    (easy) to motivate yourself with a short poem every day than it is with part of a 500-page book you are afraid of opening because you fear you can't     10    (possible) finish it.

What is it like to live in a cave once inhabited (居住) by ancient civilizations? Zhang Youbin and his wife have the answer.

Zhang is from a village in Guizhou Province. The local government entrusts him and his wife with     1     care of ancient Hongyan cliff paintings (岩画),     2     decorate the cave located deep in mountains.

The cliff paintings, first     3     (find) in 1991, have a history of over 6,000 years. Most patterns have become unclear over the years. Those still recognizable show cows, palm prints, pigs and people. Experts say the paintings are very specific     4     have high artistic value.

In 2015, the couple settled there     5     (protect) the paintings. Back then, the road leading to the site was extremely narrow and dangerous in some sections. So Zhang was determined to widen the road. It     6     (take) him two months to dig and build the roadbed with stones. “The road is now much     7     (easy) for people to walk on,” he said.

The couple’s major     8     (responsible) is preventing those without authorization from entering the protected area in case the paintings are damaged. To save their commuting (往返) time, the couple established a temporary home in a cave near the paintings.

    9     (spend) six years guarding the paintings, Zhang is very familiar with them.”I know the exact location and every detail of each painting. They are our cultural treasures and I feel greatly honored to protect them,” he said     10     (proud).

While most westerners know the story of Hua Mulan through an animated film, she     1     (be) a popular character of Chinese legend (传说) for over a thousand year. One of the most famous stories about her is     2     1917 Beijing Opera, Mulan Joins the Army.

Traditionally, no women     3     (allow) to perform in operas, so men played all the roles. Though women were no longer prohibited by the time Mulan, Joins the Army was first performed,     4     was still common for men to perform female roles, so the part of Hua Mulan was most famously played by the male actor, Mei Lanfang (1894—1961).

In short, the story is about a girl, Hua Mulan,     5     father is called up to war. As Hua Mulan worries that her father is too elderly to fight, she decides to dress as a man and go     6     his place. After many years of war, she is offered a reward for her service, but     7     (turn) it down so she can go home. It is only much     8     (late) that the friends she made during the war discover she is not a man.

Hua Mulan is a symbol to many Chinese people because she strongly illustrates values that they appreciate. A loyal daughter, she fights first for her family, and then for her country,     9     (show) bravery and complete selflessness in her actions, winning praise and     10     (admire) from others, and bringing great honor to her family.

Fall is here, but this year, tree     1    (leaf) won't be the only thing to change color as it gets colder. Stone Island has recently pushed out heat-sensitive sweaters that change color     2     (depend) on the air temperature.

Stone Island is an Italian men's clothing brand known     3     experimenting with creative clothing materials. Its heat-sensitive sweater     4    (consist) of two layers. The outer face is made of heat-sensitive fiber that changes color when exposed to cold, while the inner one is made of pure wool. The sweater     5    (constant) changes between two different colors, creating an     6    (impress) 3D effect. There are currently three different color combinations     7    (choose) from: yellow to orange, bright green to army green, and milk white to dark gray.

Heat-sensitive clothes are not unheard-of. During the 1990’s,     8     company called Hypercolor gained attention for creating T-shits that changed from colored to colorless as temperatures changed from cold to warm,     9    they only reacted to the wearers body temperature, not that of the environment.

Stone Island's heat-sensitive sweaters are now available online.     10    (dress) in this magic sweater, you'll become a human chameleon(变色龙).

Covering 7 million square kilometers of jungle and river over eight countries, the Amazon Rainforest is home to millions of sorts of plants and animals, some of     1     are still being discovered today. It's also the world’s     2    (large) supplier of oxygen and is a treasure chest for medical     3    (researcher) who are experimenting with different plants in hopes of finding cures for certain diseases.    4    , the world is at risk of losing this rich rainforest because of deforestation (滥伐森林)    5     (cause) by the actions of farmers, loggers and settlers.

The Amazon Basin     6    (lose) 20% of its rainforest since 1970. Cattle farmers have     7    (continuous) cleared the land for cows     8    (eat) on and crop farmers have begun “slash and burn” (刀耕火种), a farming method that involves cutting down forests and burning the land to make     9     suitable for agricultural purpose. Loggers have been cutting down the trees for timber(木材), further decreasing its size.

With the destruction of the Amazon Rainforest, global warming becomes more of a threat. It is up to each individual to fight against the     10    (disappear) of the Amazon by making the world know something about this environmental disaster.

China’s Zhurong Mars rover, dropped away from its orbiting Tianwen-1 mothership, touched down on the red planet early Saturday. China has become the third nation in human history to land safely on the surface of Mars-    1    its first attempt.

Zhurong, named after the god of fire in Chinese mythology, landed on a broad plain known as Utopia Planitia Friday at 7:18 p. m.

Like NASA’s Perseverance rover before it, Zhurong    2     (rely) on a heat shield (抗热涂层) and a protective aeroshell    3     (protect) it from the extreme temperatures generated after hitting the atmosphere at nearly three miles per second. Once through the plasma heating zone, a large parachute (降落伞) opened as planned, quickly    4     (slow) the craft to sub-sonic speeds.

    5     (final), about seven minutes after hitting the atmosphere, the lander was programmed to fall free of its parachute, firing small rocket    6     (engine) for a powered descent (下降) to the surface.

The last 10 months have been for Martian    7     (explore). Three spacecraft, including Tianwen-1, were launched to Mars in July 2020. The United Arab Emirates’ Hope orbiter,    8    will survey Mars’ atmosphere from space, put    9     (it) into orbit in February. Not long after, NASA’s now-famous rolling rover, Perseverance, and its history-making flying companion Ingenuity, reached    10    surface of Mars, landing in an ancient lakebed that may once have been home to Martian life.

Born and raised in Hong Kong, Steven Chan is chasing （追逐）his dream in Chinese mainland cities of Guangdong.

Attracted by the opportunities in the province, Chan     1     （move） to Guangdong in 2015 and has since then worked there. Chan, in his 30s, described settling down in mainland cities as a good decision for an ambitious young man     2     him. Decades ago, Chan's father was among the first Hong Kong     3     （businessman） entering the mainland markets.

Influenced by his family, Chan has been looking forward to     4     （set） up his own career in the mainland since childhood and his dream has finally come true. After graduating from the university, Chan at first     5     （employ） by a public company in Hong Kong and then moved to Shenzhen     6     （seek） more opportunities. With enough work experience, he     7     （eventual） got a dream job in a state-owned company in Guangzhou. After five years' working in the mainland cities, Chan said people there lead wonderful lives, with high-quality education and healthcare, fast transport networks and good use of technological     8     （innovate） in everyday life.

Apart from his own success, Chan also attempted to help others     9     want to find opportunities in the Greater Bay Area. In 2021, he has helped nearly a thousand young people from Hong Kong, Macao and China's Taiwan to set up     10     （they） own businesses in the mainland.