单选题
From Richard Halliburton's Complete Book of Marvels it was said that about a hundred years ago the people of London were amazed to see an extraordinary boat come sailing up the Thames River, which was famous in the world. The boat had four- cornered sails made of mats(帆), big wooden eyes in the bow(船首), and fantastic pictures on the stern(船尾). The boat that surprised the Londoners turned out to be the Keyling, an eighty - foot junk from Foochow in distant China. The junk had sailed around the Cape of Cape of Good Hope at the southern tip of Africa, up the western coast of Africa, and finally succeeded in getting to England. The voyage had covered fifteen thousand miles - - - more than half the distance around the world. Ahhough it was unexpected, the Keyling's voyage to London was no accident at all. Site carried a cargo of silk and ivory which could not be produced in Europe at that time, as well as a number of exotic gifts from the emperor of China, destined for Queen Victoria. People in many other countries had always mistakenly thought of the Chinese as landlubbers(不懂航海的人). From centuries of trading and seafaring(航海业) in perilous (危险的) seas, however, the ancient Chinese people had learned to build good boats and to sail them well. The Keyling proved to the world that a Chinese Junk could sail anywhere in the world.
单选题
The Keyling's voyage to London took place during ______.