【答案解析】Having gone through over 5,000 years of vicissitudes, the Chinese civilization has always kept to its original root. As the unique cultural identity of the Chinese nation, it contains our most profound cultural pursuits and provides us with abundant nourishment for existence and development. The Chinese civilization, though born on the soil of China, has come to its present form through constant exchanges and mutual learning with other civilizations.
In the 2nd century B.C., China began working on the Silk Road leading to the Western Regions. In 138 B.C. and 119 B.C., Envoy Zhang Qian of the Han Dynasty made two trips to those regions, spreading the Chinese culture there and bringing into China grape, alfalfa, pomegranate, flax, sesame and other products. In the Western Han Dynasty, China"s merchant fleets sailed as far as India and Sri Lanka where they traded China"s silk for colored glaze, pearls and other products. The Tang Dynasty saw dynamic interactions between China and other countries. According to historical documents, the dynasty exchanged envoys with over 70 countries, and Chang"an, the capital of Tang, bustled with envoys, merchants and students from other countries. Exchanges of such a magnitude helped the spread of the Chinese culture to the rest of the world and the introduction into China of the cultures and products from other countries. In the early 15th century, Zheng He, the famous navigator of China"s Ming Dynasty, made seven expeditions to the Western Seas, reaching many Southeast Asian countries and even Kenya on the east coast of Africa. These trips left behind many good stories of friendly exchanges between the people of China and countries along the route. In late Ming Dynasty and early Qing Dynasty, the Chinese people began to learn modern science and technology with great zeal, as the European knowledge of astronomy, medicine, mathematics, geometry and geography were being introduced into China, which helped broaden the horizon of the Chinese people. Thereafter, exchanges and mutual learning between the Chinese civilization and other civilizations became more frequent. There were indeed conflicts, frictions, bewilderment and denial in this process. But the more dominant features of the period were learning, digestion, integration and innovation.