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贺兰山和银川平原是沙海中的“绿岛”和绿洲。读下图,回答1~3题。
1、贺兰山成为“绿岛”的主要原因是 [ ] A、太阳辐射强,热量充足B、地形抬升,降水较多C、冰川融水多,水源充足D、土层深厚,植被茂密 2、银川平原的形成原因是 [ ] A、地壳下沉,风力沉积B、断裂下沉,冰川物质堆积C、地壳抬升,河流侵蚀D、断裂下沉,黄河泥沙沉积 3、银川平原自古以来就是重要农业区,其主要原因是 [ ] A、光热充足B、地势低平C、水源丰富D、历史悠久
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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