【题目】田纳西河流域示意图，回答下列问题。
（1）从农业分布来看，田纳西河流域是美国的______带，长期高强度的种植造成________。
（2）该地区在早期开发中，植被破坏严重，试分析其原因___________________________________________。
（3）在河流的开发利用中：图中A是河流发源地；其生态环境直接影响河流的________和________，因此应保护好它的________；图中B是流域开发重点部分，应注意水资源的________和________的保护；图中C是河谷平原，是人类活动比较集中的地区，因此是________保护的重点。
【答案】
（1）棉花 土地退化
（2）流域内人口激增，毁林开荒扩大耕地面积；获取炼铜用的木炭；矿山开采破坏地表植被。
（3）水量 水质 植被 合理分配 水质 生态环境
【解析】
试题分析：
（1）结合美国农业带的分布，图示田纳西河流域的农业带为棉花带，长期高强度的种植，会造成地表被冲蚀严重，土壤肥力下降，最终导致土地退化。
（2）田纳西河流域早期开发出现的生态环境问题是土地退化、植被破坏、环境污染；这些问题主要是由于人口过快增长，大量毁林开荒，开采矿产破坏地表植被导致土地退化、植被破坏；
（3）图中A地处河流上游，应加强植被保护；B是河流流域开发的主体，应注意水体的水质保护及合理分配；C是河谷平原，是人类活动的集中地区，应注意生态环境的保护。
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