Chinese scientists have created the world’s first light-based quantum(量子) computer, called Jiuzhang, which can     1    (reliable) show “quantum computational advantage”. It can solve a problem much more quickly than any classical supercomputer, according to a study    2    (publish) in the journal Science on Friday.

It is the second time that humanity    3    (reach) this milestone(里程碑). However, Jiuzhang used a new method oi using 76 photons(光子) to do calculations instead of Google’s, which uses superconductive materials.

Experts described the Chinese machine is a “state-of-the-art experiment” and a “major    4    (achieve)” in quantum computing. It proves the possibility of photonic quantum computation, thus providing a fundamentally different approach    5    designing such powerful machines.

Quantum computers are excellent at running simulations(模拟) that are impossible for conventional computers,    6    (lead) to breakthroughs in materials science, artificial intelligence and medicine.

Moreover, most parts of the light-based quantum machine can operate at room temperature, aside from its sensory equipment, which must be kept at -269.1℃.

This makes it significantly    7    (easy) to make and maintain than superconducting quantum computers, the main part of    8    must be kept at extremely cold temperatures.

According to interviews, Barry Sanders called it “one of the most significant    9    (result) in the field of quantum computing”. And Anton Zeilinger said that, following this experiment, he predicts there is a very good chance    10    quantum computers may be used very broadly someday.

Ancient Rome was one of the world’s most     1     (power) empires ( 帝 国 ) more than 2,000 years ago. The Roman’s ideas about roads, laws, government and buildings still influence us today,     2     (make) it the centre of Western civilization.

People may wonder how ancient Rome     3    (link) to the capital of Italy today. Actually, very few Roman     4     (native) live in Rome now as most ancient Romans were killed during conflicts in history.    5    , ancient buildings like the Roman Colosseum(罗马圆形大剧场) and Roman Forum are still standing strong today. Built in the first century A. D., the Colosseum is     6     popular tourist attraction today.

Roman roads, the most     7    (advance) roads in the ancient world, enabled the Roman Empire—     8    was over 1. 7 million square miles at the pinnacle（巅峰） of     9    (it) power—to stay connected. Over 50,000 miles of road were built by 200 B. C. and several are still     10    use today.

The Lake Poets were a small group of poets     1     (live) in the Lake District of England in the late 18th and early 19th centuries. The Lake District,     2     (know) for its beauty, is in the north-west of England. The first of the poets     3     (come) there was Robert Southey, one of the most     4     (respect) poets of his time. He was followed by William Wordsworth, perhaps Britain’s most     5     (celebrate)19th century poet, and then Samuel Coleridge, who had written the     6     (pioneer) work Lyrical Ballads with Wordsworth. Soon,     7     (draw) both by its natural beauty and a desire to be near these famous poets, other poets came     8     (live) in the Lake District. All of these poets were seen as part of the Romantic Movement.

An emotional reunion has been 75 years in the making. Two WWII     1     (survive) , 87-year-old Morris Sana and 85-year-old Simon Mairowitz, are cousins     2    grew up together in Romania. The boys had been the best friends until the war broke out in 1940, which led to both families     3     (flee) the country in separate directions.

Since the cousins had no way of communicating with each other after they fled their home nation, both of     4    assumed that the other had fallen victim to the war. While Sana ended up settling down in Israel, Mairowitz and his family built a new home in the UK.

Decades later, Sana’s daughter began using the Internet     5     (track) down and befriend all of her father’s long-lost cousins and family members. When she told her dad that his beloved cousin     6     (find), a meeting between the two was set up. Sana’s granddaughter Leetal Ofer recorded their reunion and published the footage to Facebook. In the video, Sana and Mairowitz are     7    (tearful) hugging each other and     8     (express) their gratitude for the meeting. Ofer later described the reunion     9    one of the most moving things she had ever seen. “The war tore so many families apart and bringing them together in Israel is so     10     (magic),” she said.

The Vikings,a group of people     1     ancestors came from Scandinavia, were the first Europeans     2     (reach) America. In 982 AD, there were 10,000 Vikings living in Iceland. It was said that Eric the Red was forced to leave Iceland because he had committed a murder,     3     which he got into trouble. He reached Greenland and then returned to Iceland and told people about Greenland. Later, he set sail again, with 25 ships,     4     which only 14 made it to Greenland. A man called Biarni was hoping to join his father     5     was with Eric, but he was blown off course and found himself in an unknown land,     6     which he reached Greenland. In 1002, Eric the Red’s son Leif followed Biarni’s direction and sailed to the place     7     is believed to be the coast of present-day Canada. He then sailed     8     (far) south to an island now known     9     Newfoundland. We know about their deeds through stories     10     were written down centuries later in Norway and Iceland.