In the future，life will be much ____. Maybe there will be vision phones in every ____. People can have a medical examination without a ____ or nurse in the room and do some shopping without ____their homes. And what ____education? There will be ____educational programs on the radio or TV. So many children who live in far-away villages don't need to ____to school every day. They can study at home. Each family has a robot. Robots will ____ people do their housework. Perhaps some people will fly to the ____for a holiday and some people can live under the ____.

定义在$R$上的函数$f\left(x\right)$满足$f\left(x\right)=-f\left(2-x\right)$,且当$x<1$时$f\left(x\right)$递增， 若$x_1+x_2>2$,$(x_1-1)(x_2-1)<0$则$f\left(x_1\right)+f\left(x_2\right)$的值是          （      ）                                        

已知糖尿病病人尿液含有葡萄糖；肾炎病人则肾小球部位通透性大为增加，尿液中会有蛋白质．检测病人的尿液可帮助医生确定病情．小李觉得自己身体不适怀疑自己患了糖尿病或是肾炎．如何通过一定的检测确定是否患相应的疾病．请写出设计原理和具体操作步骤及结论．

（1）设计原理：

1．糖尿病患者尿液中有____ 可用____ 进行鉴定；

2．肾炎病患者尿液中有____ 可用____ 进行鉴定．

（2）操作步骤：

1．各取2mL尿液加入甲、乙两个试管中；

2．在甲试管中加入1mL____ 和____ 的混合液，水浴加热，观察实验现象；

3．在乙试管中加入1mL，震荡，再滴入几滴____ ，摇匀，观察试管中颜色变化．

（3）现象及结论：

1．若甲试管中出现____，说明小李患糖尿病；

2．若乙试管中出现____，说明小李患肾炎．

3．若甲、乙两试管中均无上述现象，说明小李既无糖尿病又无肾炎．