【考点】科教类阅读．

【分析】本文属于说明文阅读，作者通过这篇文章主要向我们描述了正如谚语人往高处走，水往低处流所说，虚拟水从山上到流经河流到人类的消费所经历的旅程，是如此的漫长，许多缺水国家的虚拟水甚至基本都来自于其他国家，它真正做到了环球旅行．

【解答】25．C．推理判断题．文章主要在讲正如"人往高处走，水往低处流"，而现实生活中缺水国家的水基本都来自于其他国家，因此可推测As the proverb goes是正如谚语所说的意思，因此proverb介绍了这篇文章的主题；故选C．

26．C．细节理解题．根据文章最后一段"dry countries like Israel and Kuwait，both in the Middle East，get the majority of their virtual water from other countries"和"like the Netherlands and the United Kingdom，also get the majority of their virtual water from other places"可知色列，科威特，中东国家，荷兰，英国等国大部分虚拟水都来自其它地区；故选C．

27．D．主旨大意题．通读全文，可知文章主要在讲虚拟水从山上到流经河流到人类的消费所经历的旅程，有时它们甚至经历了许多国家，因此可知最合适的标题是"水的环球旅行"；故选D．

28．A．推理判断题．根据文章，可知文章主要在讲虚拟水从山上到流经河流到人类的消费所经历的旅程，有时它们甚至经历了许多国家，文章运用了举例的手法给出了许多具体的事实，比如缺水的国家等，因此这是一篇科技类说明文，它一般会发表在科技新闻报道上；故选A． 

29．Though many Internet celebrities try to shrug off their fame，Yan Mingliang，27，has dreamed of joining the Internet elite（精英） ever since he entered college．

However，luck didn't favor him．Instead，fame fell into the lap of his pet dog，Beiji．In early 2015，Yan used his microblog to post two pictures of Beiji lying on the ground，and they went viral on social media．Because he took the photos at a strange angle，it almost looks like Beiji's body has fallen apart．

Finally，Yan got to experience what is like to be an Internet celebrity，or more accurately，the owner of an Internet celebrity dog．New followers started to flood in，and Yan received hundreds of private messages each day．In less than four weeks，Yan managed to attract more than 20，000followers．"I am famous now．"Yan thought at that time．

However，fame didn't just bring joy，but also annoyance．Since Beiji was only 3months old and Yan sometimes had to put him into a cage as a means of"education"，there were also private messages from followers who fiercely criticized Yan for being too cruel．

"It gradually occurred to me that no matter how frankly you present yourself on social media，Internet users only witness part of your life．And their judgments depend on that partial life story of yours，"said Yan，"They don't know how hard it is to raise a pet dog when you're unemployed，Yan explained．They also don't care about whether the dog they're enjoying is being pushed too hard．"

Yan finally decided to leave his Internet fame behind and focus more on his real life．"The lesson I learned is that，if you can't live up to your followers'expectations，it's better not to be an Internet celebrity，"he said．