Question 6 is based on the following news. At the end of the news item, you will be given 10 seconds to answer the question.
Now listen to the news.

A．Government officials say they fear UNITA rebels will take control of border areas with Congo Kinshasa.

B．UNITA's military vehicles are entering the Angolan border area every day.

C．Explosive devices will be buried in that area in order to prevent the UNITA rebels from entering the region.

D．Government troops have fled the cities of Malanje and Kuito.

文明的冲撞与融合客观上促进了人类历史的进程，下面选项属于文明融合的是（）

A.亚历山大东征

B.希波战争

C.罗马帝国的扩张

D.马可·波罗来华