题目

As for old people，some of the applications are hard to use because they didn't grow up with them. They don't have simple models of how they should work，what to do when something doesn't work or where to go for help. We make it as easy as possible to be used for people who are not familiar with the technology. I think there is huge potential(潜力) and we are designing it. The ability to connect to friends，who remember the same movies and news and music，is really important，especially as people get old. They end up in retirement homes and they aren't always close to their frie下图中圆柱为空气柱，箭头表示空气垂直运动方向。读图，完成下列各题。关于a 、b两图，下列说法正确的是A.a图表示北半球夏季、低气压 B.b图表示北半球冬季、低气压C.a图表示北半球冬季、高气压 D.b图表示北半球夏季、高气压