题目解析:
D 根据 Tiber River 定位,看到后面的描述说: It has been estimated that Monte Testaccio contains the remains of some 53 million amphorae, in which around 6,000 million liters of oil were imported into the city from overseas…从这个惊人的进口的数量来看,当时的进出口贸易非常繁华。对应答案 D。而 A 选项的建造时间是无法推测的,原文只是说在 hill 上发现的那些 broken oil amphorae 主要是公元2.3世纪的;B 的 oil 和原文说的 oil amphorae 不是一回事,过度推断;C 选项在原文完全没有相关内容。