The natural capital in Paragraph 5 refers to______.
A. the defense built by human being to prevent natural disasters
B. the barrier formed by natural features to natural disasters
C. the capital that government pour into restoring natural landscapes
D. the capital that banks reserves for relief work after natural disaster
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我国现存最早的藏书楼宁波天一阁建成于_____朝。
在古代唐朝的皇宫里，夏天由宫女推动高大的水车，将水洒到宫殿的房顶上，水再顺房四周流下，这样做的主要目的是为了_____。
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