The destruction of habitats（栖息地）

The destruction of habitats（栖息地）all over the world is the primary reason species are becoming extinct（灭绝）or endangered. Houses, highways, dams, industrial buildings, and ever-spreading farms now dominate _____（21）formerly occupied by forests, deserts, and wetlands. _____（22）the beginning of European settlement in America, _____（23）, over 65,000,000 acres of wetlands have been drained. One million acres alone vanished _____（24）1985 and 1995.Habitat destruction can be _____（25）or it can be subtle, occurring over a _____（26）period of time without being noticed. _____（27）such as sewage from cities and chemical runoff from farms, can change the _____（28）and quantity of water in streams and rivers. To _____（29）living in a delicately balanced habitat, this disturbance can be as _____（30）as the clear-cutting of a rainforest._____（31）remaining habitats are carved into smaller and smaller pockets or islands, remaining species are forced to exist in these _____（32）areas, which causes further habitat _____（33）.These species become less adaptable to environmental _____（34）; in fact, they become _____（35）endangered. Scientists believe that when a habitat is cut by 90%, one-half of its plants, animals and insects will become extinct.21._____.
A、landscapes
B、cities
C、maps
D、pictures
【正确答案】：A
【题目解析】：词义辨析题。空格后所说的森林、沙漠和湿地都是陆地上的风景、风貌，这里是说森林、沙漠和湿地都被房屋、公路、水坝、工业建筑、农场代替了。landscapes有“风景”的意思，符合题意。cities意为“城市”，maps意为“地图”，pictures意为“图画，照片”。