You are going to read a passage with 10 questions. For questions 1-7, choose the best answer from the four choices marked (a), (b), (c) and (d). For questions 8-10, complete the sentences with the information given in the passage by using the original words or phrases . "Out of Eden" Walk: The greatest journey A. On the eve of a greatest journey—one that starts in Africa, winds through the Mideast and Asia, hops over to Alaska, goes down the western US, then Central and South America and ends in Chile—one question nagged ( 困扰 ) the American journalist Paul Salopek: Should he take the keys to his house in Texas? B. The Ethiopia-to-Chile walk, which took human ancestors some 50,000 years to make, is called "Out of Eden" and sponsored by National Geographic, the Knight Foundation and the Pulitzer Center on Cr Reporting. A two-time Pulitzer Prize winner, Paul Salopek has embarked on this seven-year walk around the world. C. "I am on a journey. Starting in humanity's birthplace in Africa , where homo sapiens ( 现代智人 ) were born presumably through evolution, and ending at the southern tip of South America, I am following the pathways of our ancestors, who first discovered the earth at least 60,000 years ago. This remains by far our greatest voyage, not because it delivered us the planet, but because the early homo sapiens who first roamed beyond the mother continent also left us the qualities we now associate with being fully human: complex language, abstract thinking, a compulsion to make art, a genius for technological innovation, and today's many races," said Salopek. D. Salopek departed a small Ethiopian village and took his first steps of the global trek. The 21,000-mile walk will cross some 30 borders, where he will encounter dozens of languages and scores of ethnic groups. The 50-year-old's quest is to retrace man's first migration from Africa across the world in a go-slow journey that will force him to immerse himself in a variety of cultures, so he can tell a global mosaic of people's stories. E. "Often the places that we fly over or drive through aren't just untold stories, but they are also the connective tissues between the stories of the day. Those places explain how environment and education are connected to the economy," Salopek told the Associated Press by satellite phone from the small village, his starting point. F. Throughout the unimaginably long walk, Salopek is pausing every 100 miles to tend the campfire of our shared humanity by recording a narrative milestone, consisting of photographs of the ground and sky, ambient sound at that location, and a brief, standardized interview with the nearest person. He also plans to write one major article a year, the first of which appears in December's National Geographic. G. Salopek's highlight from his first year was his access to Saudi Arabia, a country that maintains tight controls on what outside journalists can see. He noted the oil-producing nation is 83 percent , a higher percentage than the US. "I have been moving slowly through Saudi culture, walking along highways with camels," said Salopek. "This nation makes global headlines over protests against its effective cultural ban on women drivers. However, I have encountered many women drivers. They just happen to be in places where there are no policemen or reporters," added Salopek. In some places Salopek knew he was being watched by government officials, who explained their presence by saying they were concerned for his safety. But most times he has had unfettered access. He's the first outside journalist to walk through Saudi Arabia since 1918. H. Salopek's planned walk may be among the longest in modern times, but Guinness World Records doesn't track "longest walk" because this feat ( 壮举 ) can't be standardized. Such investigative walks have been taken before Salopek. Rory Stewart, now a British parliamentarian, once walked across Iran, Pakistan, Nepal, and then circled back to Afghanistan, a journey chronicled in the 2005 book The Places in Between. Stewart's walk took 21 months. "The best thing about it for me was simply that it gave me access to people and communities. It forced you to stop every 20 or 25 miles. It forced you to spend nights in village homes," said Stewart, who spends six weeks every year walking through his political district. "For me the real great thing about this kind of journey is that we live in a world which is very focused on destinations, a city or a tourist site, which ignores 99 percent of the country." I. At first Stewart was tempted to carry a weapon on his long journey in Nepal or Afghanistan, but in the end he was pleased he didn't because he believes talking and politeness can solve any problem. Salopek says "you make yourself vulnerable when you're on foot", but he won't carry a gun. He has security procedures in place that he can't share. He knows he may have problems at some borders, but intends to solve the problems when they crop up, relying heavily on adaptation just as our ancestors did. J. Stewart's advice to Salopek is that he should find people to be with at night. Long days of endless walking leave you tired and hungry, but Stewart said the best hours of Salopek's journey will not be during daylight, but in the evening hours around a dinner table or fireplace. K. That's what Salopek plans to do. He hopes to walk with local people throughout his journey, learning new languages or finding English speakers along the way. He says the journey will slow down his own process of writing, and he hopes he can also slow down readers who live in a world flooded with information. "I love long-form writing, and I hope that there will be an audience for this, and that people will be willing to wait for stories to come episodically," said Salopek, who's engaging with the major stories of our time—from climate change to technological innovation, from mass migration to cultural survival—by walking alongside the people who inhabit these headlines every day. Moving at the slow beat of his footsteps, Salopek is also seeking the quieter, hidden stories of people who rarely make the news. L. Salopek's walk is extraordinary and incredibly ambitious, according to Riall Nolan, a professor at Purdue University, who hopes Salopek has the physical and mental stamina ( 毅力 ) to finish. "What is he going to get out of this? He's going to learn a lot about human diversity. He can tell his grandchildren and say to people with authority: I have seen thousands of ways people can be human. We are an amazingly diverse species. There is not just one way to be human," Nolan said. M. The first part of the greatest journey took Salopek across the Ethiopian desert, so while he was still at home, he sent a money order to the tiny East African nation to buy a camel that would help him carry water. Carrying little more than a backpack with a lightweight Apple laptop, a satellite phone and camping gear, Salopek plans to send occasional updates via Twitter. Before departure, he posted a picture on Twitter of his house keys and wondered if he should pack them. He has decided not to tell. "Maybe I should keep that as a secret," he said over the satellite phone connection. 1. When packing for his greatest walk, Salopek was a bit at a loss __________.