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March 14 is right around the comer, and math learners know     1     that means. It’s Pi Day, a holiday honoring one of math’s most famous constants (常量): pi.

The number pi, or π, is equal to the circumference (圆周长) of a circle     2     (divide) by the circle’s diameter (直径). That comes out to about 3.14159. This is true for circles of all sizes, from     3     (penny) to pizzas to planets. Pi’s value is often rounded to 3.14. That’s why Pi Day     4     (celebrate) on March 14. It’s also why one Earth-sized planet orbiting another star every 3.14 days is nicknamed “Pi Earth.”

But the exact value of pi is     5     (actual) impossible to write out. Last year, a     6     (power) computer calculated pi to record-breaking 62.8 trillion (万亿) figures. And in 2005, one 23-year-old used clever mental tricks to recite nearly 68,000 of those figures from memory. No one, though, will ever get to     7     end of pi.

Historians aren’t sure when people first     8     (discover) the concept of pi. But it’s been known in some form     9     almost 4,000 years. Ancient Greeks and Babylonians knew estimates of it. The Egyptians may have used pi     10     (build) the pyramids. And still today, pi is used in just about all math involving circles.

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Every day at 9 am, Zhang Canjin, 58, comes to Drum Tower Street in Ningbo and walks into a small house     1     less than 10 square meters. Settling himself     2     (comfortable) in his usual chair, the inheritor of copper coin knitting starts his day.

In ancient times, copper coins     3     (represent) fortune and wealth. Linking copper coins one by one had the positive meaning of accumulating wealth. In 2018, copper coin knitting was listed as     4     intangible cultural heritage.

Zhang learned the skill from his dad     5     young. There weren’t that many ideas back then, just traditional ones like Chinese knots and swords. But this didn’t satisfy Zhang as he gradually mastered the skill. “Knitting the coins into different shapes doesn’t sound difficult, but the essence is     6     (think) big and be creative.” Zhang said.

Since starting his copper coin knitting store in 2014, Zhang     7     (spare) no effort in thinking big. To attract public attention and better promote the skill, Zhang spent two months crafting armor (铠甲) using over 8,000 coins,    8     (tailor) to his own body proportions, in2017. He then applied for a national patent following the work’s     9     (complete).

This success gave him more confidence to continue with his work. Even now, Zhang uses his we alth of creative ideas to make more copper coin products and shares the skill with a    10     (wide) audience.

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In the 1950s, the Egyptian government’s proposal to build a new dam caused protests     1     the local people were worried about destroying cultural relics. A committee     2     (establish) to limit damage to the Egyptian buildings. With the help of global community,     3     (temple) and other cultural relics were protected. Aswan Dam was built     4     (successful). Big challenges led to great solutions.

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Tengwang Pavilion（阁）is located on the bank of the Ganjiang River, in Nanchang City, Jiangxi Province. It     1     （admire）widely by visitors from all over the world since it was built. In terms of its     2     （high）, size and architectural（建筑的）style, this pavilion is one of the excellent     3     （example）of Chinese buildings that are famous worldwide.

As a brother of the emperor Taizong, Tengwang asked people     4     （build）the original building in the year 653 during the Tang dynasty（618-907）. Pavilion of Prince Teng was named     5     him. Wang Bo,     6     gifted poet of the Tang dynasty made it well-known after he wrote his “Essay on Pavilion of Prince Teng". However, in 1926, it was destroyed by a fire. The current building is the result of     7     was rebuilt between 1983 and 1989.

The existing pavilion is even     8     （impressive）than the former one.     9     （surround）by rock gardens and lakes, it is built in the architectural style of the Song dynasty（960-1279）. It is in fact not just one building but a complex（建筑群）. The main building,     10     （cover）47,000 square meters, is about 189 feet high with two smaller pavilions standing on its north and south sides.

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It is well-known that the Great Wall is a symbol of China and enjoys great popularity. In c. 220 B. C., under Qin Shi Huang, sections of earlier fortifications (防御工事) were joined together     1     (form) a united defence system against invasions from the north. Construction continued up to the Ming dynasty (1368-1644),     2     the Great Wall became the world’s largest military structure. Its historic and strategic importance is matched only by its architectural significance.

The Great Wall was     3     (continuous) built from the 3rd century BC to the 17th century AD on the northern border of the country as the great military defence project of successive (连续的) Chinese Empires, with a total     4     (long) of more than 20, 000 kilometers. The Great Wall begins in the east at Shanhaiguan in Hebei province and     5     (end) at Jiayuguan in Gansu province to the west. Its main body consists     6     walls, horse tracks, watch towers, and shelters on the wall, and includes fortresses (要塞) and passes along the Wall.

The Great Wall reflects conflicts and exchanges between     7     (agriculture) civilizations and nomadic (游牧的) civilizations in ancient China. It is one of the significant physical     8     (proof) of the far-sighted political strategic thinking and mighty military and national defence forces of central empires in ancient China, and is     9     outstanding example of the superb military architecture, technology and art of ancient China. It embodies incomparable significance as the national symbol for     10     (safeguard) the security of the country and its people.

【推荐3】Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank. Write your answers on the answer sheet.

American Indians

When you think of a typical American, whom do you picture? A pretty white American like Taylor Swift? Or a handsome black American like Barack Obama or basketball star Kobe Bryant? In fact, there was a time when the average American looked like     1     of these people.

Back in the year 1500, the average American was a brown-skinned hunter-gatherer who probably rode a horse and wore clothing     2     (make) from animal skins. Today, these people—who tend to be connected with their individual tribes (部落) such as Iriquos, Apache and Navajo—are referred to     3     “Native Americans”,   “American Indians” or simply “Indians”.

You     4     say that you have never even heard of American Indians. That’s because there aren’t very many left.     5     (settle) in North America, the settlers from Europe were involved in bitter conflict with the native peoples. After the Revolutionary War, conflicts with natives continued as the states were created     6     would later make up the US. American Indians were treated as a military “enemy”     7     1924, when the few Indians still alive at that point     8     (award) US citizenship.

    9     the story of the American Indians has been a sad one, these people’s legacies (遗产) are still felt every day in the US. There are many US geographical names     10     (come) from Indian languages and numerous successful academics and other important US leaders descended (是……的后裔) from Indians.

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Hangzhou, a medium-sized city of eight million people in Zhejiang Province, is home to China’s green tea: longjing, known in English as Dragon Well.

    1    “Dragon Well” means exactly is a little confusing. In China, Xihu longjing refers to a specific tea variety    2     (dry) into a flattened feather shape and grown exclusively in the Xihu district surrounding Hangzhou’s West Lake,     3    region with cool, moist air, rocky mountains, acidic soil, and dramatic temperature fluctuations (起伏). All of them is    4     (practical) designed for growing good tea. But the green tea    5     (grow) and sold all over Zhejiang province and overseas, the regional distinctions are usually lost in    6     (translate). As a result, any green tea that is dried into a Dragon Well-like shape might be sold as Dragon Well.

    7    the source, all Dragon Well comes from the same plant as all other tea—camellia sinensis (野茶树). Dragon Well’s green color and special flavor are the result of climate, good farming, and careful handling, not genetics,     8    is why its range of quality is so wide. But that’s not enough    9     (explain) its idolized status among tea drinkers. What makes Dragon Well so highly prized?     10     (it) popularity stretches back to the Qing Dynasty, when emperor Qianglong declared it the official tea of the imperial court.

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Everybody likes watching acrobats (杂技演员). The acts sometimes seem scary and dangerous, and there is thrill and wonder.     1     Chinese acrobatics troupes (表演团) travel internationally, they are not commonly seen by audiences outside the country. While in China you might want to see the     2     (amaze) feats of balance and skill.

The acrobats developed their styles     3     (base) on traditional ancient arts such as dance, theater, martial arts, and magic shows and they are distinctive and incorporate traditional skills and physical exercises. Chinese acrobats tend to emphasize balance and extreme     4     (flexible) more than the troupes do in Russia or the West. This might be due to the influence of martial arts styles. Chinese acrobats     5     (intensive) practice timing and coordination. The individual performers practice to cooperate precisely. They use martial arts skills in     6     thrilling and sometimes comedic fashion. The Beijing Red Theater’s “Legend of Kungfu” show is an example. Many of the shows will have traditional Chinese music that is recorded or performed live by musicians     7     (play) traditional instruments. The costumes or the themes may     8     (draw) from a familiar opera. The acrobats may perform scenes from popular legends, stories,     9     novels of the ancient past such as The Monkey King. You might not recognize the story or the music, but you’ll still enjoy the sound, color, and     10     (usual) costumes.

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The Lunar New Year     1     (celebrate) by around 1.5 billion people across the world.

Lunar New Year     2     (vary) in different countries, but celebrations usually involve families gathering together for feasts. Schools and     3     (business) shut for a few days as the celebrations take place. Traditional foods include dumplings, rice cakes and noodle soup,    4     are thought to bring happiness and wealth. Spreading good fortune is a major theme, and firecrackers are lit     5     (drive) evil spirits away. Parents and grandparents give children money in envelopes. There are parades (游行) and performances,    6     (include) lion dances and dragon dances. Chinese New Year is the     7     (large) Lunar New Year celebration, and takes place over 15 days, ending in a lantern festival.

The Chinese zodiac (十二宫) is divided     8     12 blocks. Each block lasts a year and is represented by     9     animal. This year is the Year of the Ox. The date for Lunar New Year is worked out through the traditional Chinese Lunar calendar, which is based on the Moon's     10     (move). It depends on the new moon arriving in Asia between January and February.