Warming up & Listening & Speaking Unit 2 Crossing Limits language points Warming up Zheng He, in the year between 1405 and 1433, seven large treasure fleets sailed westwards on voyages of trade and exploration. Under the command of Zheng He, the fleets set sail from the South China Sea across the Indian Ocean to the Red Sea, and then traveled further south, discovering the eastern coast of Africa. He renewed relations with the Kingdoms of the East African coast.One African king sent the Ming emperor a royal present: two gifaffes. 　　 James Cook (1728-1779) was the greatest Britain navigator. Cook enlisted in the Royal Navy in 1755. In 1768 he was promoted and sent to the Pacific where he surveyed Tahiti, New Zealand, and Australia. On his famous second expedition (1772-75) he explored Antarctica. In 1776 he undertook his third and final voyage in which he explored the West coast of North America and tried to locate a passage between the Atlantic and Pacific oceans. On this voyage he discovered the Hawaiian Islands, and sailed up