1.【解析】A.酸雨的pH值低于5.6.
2.【解析】D.雾的形成需要一定的温度条件，田野清晨温度较低，空气中水蒸气遇冷液化形成雾，城市有热岛效应，温度相对较高，雾现象不明显。其实除了城镇气温较高，形成热岛的原因之外，另一个原因是田野中有大量的植物进行蒸腾作用，水蒸气的含量比较高。因此D项当选。
3.【解析】D.由于切断电源后再次启动电脑需要花费一定的时间，有些人即使不使用电脑，也一直不关闭显示屏。测试数据表明，如果将电脑设置为将作业数据暂时保存于硬盘的“睡眠状态”,此时的耗电仅约为3.8瓦，即使是向内存供电的“待机状态”,耗电也只约5.7瓦，与始终打开显示器相比可节电约70%.因此D项说法不成立，当选。
4.【解析】B.“外争主权，内除国贼”是五四运动提出的政治要求之一，而“驱除鞑虏、恢复中华、创立合众政府”是孙中山创立兴中会时提出的政治主张，显然③早于①，四个选项中只有B项符合。②“习兵战不如习商战”是早期维新派中的郑观应明确提出的思想。
5.【解析】C.《蓝色多瑙河》是奥地利作曲家约翰·施特劳斯创作的一首圆舞曲即华尔兹，有“圆舞曲之王”的美称。《命运》是贝多芬创作的一部歌颂光明战胜黑暗的交响曲。《天鹅之歌》是舒伯特的交响乐作品。《朱庇特交响曲》的作者是莫扎特。因此C项当选。
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