A. Zhang Qian's voyages to the West B. Zheng He's voyages to the West
C. Columbus discovered the new continent of America. D. Magellan's fleet traveled around the world
Analysis of test questions: This question examines world famous historical figures through couplets. Through the key words: "Indonesia" and "exploring first in Kaigemai", it can be judged that this couplet is a tribute to Zheng He's voyage to the West, because Zheng He's voyage to the West reached the Red Sea coast and the east coast of Africa as far as possible, so the answer is B.