[题目]近年来.我国高铁发展较快.京沪.京广.沪昆等高铁相继开通.据此完成下列问题.[1]高铁在平原地区多以桥代路.主要目的是A．降低建设成本 B．节约土地.少占耕地 C．便于观光游览 D．减弱噪声[2]我国东部地区铁路网密度远大于西部地区.其最主要的自然原因是A．河流密度的差异 B．地质差异 C．气候差异 D．地形差异题目和参考答案——青夏教育精英家教网—

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【题目】近年来，我国高铁发展较快，京沪、京广、沪昆等高铁相继开通。据此完成下列问题。

【1】高铁在平原地区多以桥代路，主要目的是

A．降低建设成本 B．节约土地，少占耕地

C．便于观光游览 D．减弱噪声

【2】我国东部地区铁路网密度远大于西部地区，其最主要的自然原因是

A．河流密度的差异 B．地质差异 C．气候差异 D．地形差异

【答案】

【1】B

【2】D

【解析】

【1】与传统的梯形路基相比，以桥代路可以少占耕地，因此，在我国东部平原地区，高铁多以桥代路，B项正确。以桥代路还有其他好处，如与其他交通线路实现立交，减少对其他交通方式的干扰；减少其他因素对高铁的干扰，保障高铁运输安全等。

【2】地形对交通密度有很大影响，我国东部地区平原和丘陵比重相对较大，西部地区山地和高原比重相对较大，因此，我国东部地区铁路网密度远大于西部的最主要的自然原因是地形差异。

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