The task is about reading the given story and question, then finding an answer to the given question. Based on the passage provided and the given question, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

story: The Vatican Apostolic Library (), more commonly called the Vatican Library or simply the Vat, is the library of the Holy See, located in Vatican City. Formally established in 1475, although it is much older, it is one of the oldest libraries in the world and contains one of the most significant collections of historical texts. It has 75,000 codices from throughout history, as well as 1.1 million printed books, which include some 8,500 incunabula. 

The Vatican Library is a research library for history, law, philosophy, science and theology. The Vatican Library is open to anyone who can document their qualifications and research needs. Photocopies for private study of pages from books published between 1801 and 1990 can be requested in person or by mail. 

In March 2014, the Vatican Library began an initial four-year project of digitising its collection of manuscripts, to be made available online. 

The Vatican Secret Archives were separated from the library at the beginning of the 17th century; they contain another 150,000 items. 

Scholars have traditionally divided the history of the library into five periods, Pre-Lateran, Lateran, Avignon, Pre-Vatican and Vatican. 

The Pre-Lateran period, comprising the initial days of the library, dated from the earliest days of the Church. Only a handful of volumes survive from this period, though some are very significant., question: How many books survived the Pre Lateran period?
a handful of volumes

story: Every day Yang Hongwei takes the bus home from work, staring silently at the European-style villas , luxury cars and twinkling lights from the shopping center that he sees through the window. 

Yang works for a software company in Zhongguancun. He dreams of such a life, away from poverty, and that hope has kept him in Beijing for three years since he graduated from university. 

Soon Yang squeezes his way off the bus to the reality of his life: his home--a 10-square-metre room that costs 550 yuan(81 US dollars) or about one-fifth of his salary in rent every month. It's very cold inside the house as it has no central heating system. He has to stand the long and cold winter. Determined to achieve his dream, Yang says he has changed jobs "numerous" times in the past three years and is considering quitting his present job. 

Yang's frustration over his life as a migrant is shared by many other graduates that have moved into big cities. Together they have come to be called the "ant tribe", a term created by Chinese sociologists to describe the struggles of young migrants, who, armed with their diplomas, flood to big cities in hopes of a better life only to put up with low-paying jobs and poor living conditions. They share every similarity with ants. They live in colonies in crowded areas. They're intelligent and hardworking, yet unknown and underpaid. The term, sociologists have said, also reflects their helplessness in a world governed by the law of the concrete jungle--only the strongest survive. 

A survey in Ant TribeII found nearly 30 percent of the "ants" are graduates of famous key universities--almost three times the percentage of 2009. Most have degrees in popular majors, such as medicine, engineering, economics and management. In addition, 7.2 percent of the "ants" have at least a master's degree compared to 1.6 percent in 2009. Most said the economic recovery did not really improve their financial situations, and 66 percent said their incomes fell short of their expectations, the survey also found. 

For two years, Lian Si, a post-doctoral fellow at the Center for Chinese and Global Affairs of Peking University, who has studied the phenomenon, led a team of more than 100 graduate students to follow the groups in university towns like Beijing, Shanghai, Guangzhou, Wuhan and Xi'an. Lian evaluates the total population of the "ant community" in major cities at one million across China, with about 100,000 found in Beijing alone. Lian predicts that an increasingly challenging job market will see the ant tribe growing further in number. Another 6.3 million graduates are expected to join migrant workers and other job hunters in what promises to be a fierce labour competition. 

The ant tribe's embarrassing living situations have become a serious social issue, and the government should develop "second-and-third-tier cities" to attract more graduates from big cities. However, "ants" expect more study and training opportunities in big cities, which keeps them in positive mindsets despite their situations. As in the case of Yang, he is optimistic about getting a new job soon, having received eight interview offers in a week after sending out his resume. The prospect of landing a higher-paying job keeps him hopeful of moving out of the slum district soon. The sooner the better., question: Who created this term?
Chinese sociologists

story: CHAPTER XXV 

PERILS OF THE FLOOD 

"Dave! Dave!" yelled Ben, as he saw our hero disappear into the swiftly-flowing river. "Look out, or you'll both be drowned!" 

"What's the trouble?" yelled Jerry Blutt, as he turned back for the first time since leaving the island. 

"Buster slipped in, and Dave went after him," answered Ben. "Oh, what shall we do?" he went on, despairingly. 

"Here--we'll throw out the rope!" answered the camp-worker, and took from his shoulder a rope he carried. 

In the meantime Dave had come up and was striking out with might and main for his chum. Our hero realized that Buster must be hurt, otherwise he would swim to save himself. 

"Must have struck on his head, when he went over," he thought, and he was right, poor Buster had done just that and now lay half-unconscious as the current swept him further and further from his friends. 

It was too dark to see much, and Dave had all he could do to keep in sight of the unfortunate one. But presently the stout youth's body struck against a rock and was held there, and our hero came up and seized the lad by the arm. 

"Buster! Buster!" he called out. "What's wrong? Can't you swim?" 

"Hel--help me!" gasped the fat youth. "I--I got a knock on the head. I'm so--so dizzy I do--don't know what I--I'm do--doing!" 

The current now tore Buster away from the rock, and he and Dave floated along on the bosom of the river for a distance of fifty yards. It was impossible to do much swimming in that madly-rushing element and Dave wisely steered for shore. He continued to support his friend, who seemed unable to do anything for himself. , question: what did Dave decide about Buster?

that he must be hurt

