1. (2022高三上·威远月考) 阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

China's first overpass for wildlife migration has already come into use. Lying over the  (new) constructed National Highway 216, the bridge is able to link animal habitats  (separate) by the road．

The national highway  (design) with the environmental protection as a top priority. Based on years of  (science) observation of wildlife migration in the region, the bridge was built with the purpose of reducing the highway's effect  the animals. The wildlife overpasses and underpasses let animals  (cross) over or under busy roadways safely and allow them to use  (they) customary paths, which would otherwise be blocked. Those passageways, with  total length of 59 kilometers, enable antelopes and other animals to go across the railway freely.

So far, China  (put) great effort into achieving harmonious coexistence between human development and the protection of wildlife. The Qinghai-Tibet Railway,

 is the world's highest railroad, has 33 underpasses for the migrating animals.