阅读下面短文，掌握大意，然后从1-20各题所给的四个选项（A、B、C和D）中，选出最佳答案。
As for daily life, I think that we will be able to 1most of our shopping by 2 and this will be taken to our homes, so 3there won’t be any 4to go out to the 5.I’m sure that most of our homes will have a video 6 so we will be able to 7the person we are talking to. We will also be 8holovision which will give you three dimensional( 三维的 ) life size picture 9your screen--this will replace television. 10important technology, there will be no more road accidents. Cars will be guided by computers so people will not have to do any more driving.
I think most of our food will be in the form of pills and liquids which will have all the vitamins and protein(蛋白质 ) 11we need for a balanced diet. Only when we go out for social 12 will we eat the same food as today, but we will 13 be eating meat.
About once a year our bodies will go into a health center for a service in much the same way as a car 14be repaired. So, for example, our veins( 静脉 ) will be cleaned out, our blood made pure, our muscles built up and so on. Any part that is15 could be replaced by a new plastic part. We will all be much16by then anyway, because there will be more 17 for us to use for exercise. Also a safe medicine will have been discovered which will allow people to lose or put on 18 as they need. One exciting development will be the possibility of being deep frozen 19
A period of time and then20some years later. I would be interested in that myself.
Cd+2NiO(OH)+2H2O由此可知，该电池放电时的负极材料是