D. they extended their activities to the eastern coast of the Bay of Bengal and the whole Indo-China Pen. ,and reached China by both the land and the sea route,thus establishing direct trade relation and widening up their knowledge about Chia.

• 公元二世纪，罗马人的活动范围扩展到孟加拉湾东海岸地区和整个印支半岛，并从海陆两路到达中国，同中国建立起了直接的贸易关系，希腊－罗马世界对中国的知识亦随之大为发展；