图示可以简明、直观的表达一些信息，是化学学习的一种重要手段．仔细读图，根据图示完成下列各题．

（1）图1是表示____；

（2）图2是元素周期表中氙元素的某些信息，据此可知，氙的相对原子质量是　____ 　；

（3）图3是氯原子的结构示意图，其中，x=____ ；该原子在化学反应中容易____（填“得”或“失”）电子；

（4）图4是a、b、c三种固体物质的溶解度曲线．t₁℃时三种物质的溶解度由大到小的顺序是____ ；t₂℃时c的饱和溶液温度升高到t₃℃时，溶液为____ （填“饱和”或“不饱和”）溶液．

阅读下面短文，将短文中画线部分的句子翻译成中文
                                                                                How Much Water Is Needed a Day?
   Many people think they should drink eight glasses of water a day．Why? Because that is what they have been told all their life．But a new report on science gives some different suggestions：people should drink according to their bodies．____ They should drink as much water as they would like to drink．
   The report says most people meet their daily needs for water by letting thirst be their guide．It also gives people some good suggestions：women should get about 2.7 liters（升）of water every day，while men should get about 3.7 liters．
   There is an important difference．____ The report doesn’t tell people how many glasses of water to drink．Instead，the experts say it may not be possible to know how many glasses people really need．This is because the daily want of water can include the water in foods．