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TO 寒雨心亭:最近较忙,出差刚回,留言迟复了。南水北调工程到底对不对?这个问题已经有答案,相信在工程完工运行后答案会更加清晰。众所周知,中国是一个严重缺水的国家,解决水资源时空分布不均问题,一方面靠水库蓄水调节和调水工程输水补给,另一方面要大力建设节水型社会,前者是一种手段,后者是解决问题的关键。南水北调工程可以解决华北一些大城市的供水问题。南水北调是实现中国水资源优化配置的重要手段,同时也会降低中国社会经济发展所要付出的代价和成本,可谓一举多得。
TO alexandra:虽然单反相机的价格正在逐渐降低,但我在推荐相机时依然要提请朋友们首先弄清自己为什么要买单反。因为并不是只要用了单反就一定能够拍出自己满意的照片。适合自己的(这里包括经济实力、个人体力、拍摄题材和用途、拍摄技术和技巧等诸多因素的权衡)才是最好的。Canon的单反相机有很多系列,如果是普通爱好者,可以选择1000D或450D、500D;如果你是中级发烧友,可以选择50D或7D、5D MarkⅡ。镜头的配置,如果米多体力好,红圈专业镜头当然最好。否则,副厂镜头也是一个适用的选择。原厂套头价位低,可以用以练兵。