Although only about one person in ten with a positive skin test or blood assay ever develops. TB disease, the risk continues throughout the rest of your life. The symptoms of TB are. common to many other illnesses.
Marco Polo-Great Silk Road. For many centuries the Great Silk Road connected a complex network of trade routes from Europe with Asia. It was a way to establish contact with the great civilizations of China, India, the Near East and Europe.
Who Was Marco Polo? By Joan Holub Introduction: Marco Polo lived in Italy more than seven hundred and fifty years ago. He is famous for traveling to China and back (more than 11,000 miles) and recording his adventures in a book. He said he spent many years with Kublai Khan, a powerful ruler in that part of the world. Marco Poloâs book became a source of trouble for him, and people have argued about it since it was written. TEACHERS: Due to copyright issues, for access to Text 1 either obtain a copy of the book cited below