墨尔本PTE 阅读排序 2928

A - Urban planners must consider these threats and work to allay them. B - Historically, in Europe and many other parts of the world, settlements were built on higher ground for the purposes of defence and to be close to fresh water sources. C - If the dangers are only in specific areas then they can make the affected regions into parkland or a green belt, often providing the added advantage of open space. D - Cities have often spread down from these locations onto coastal plains, putting them at risk of floods and storm surges.