阅读下列短文，从每小题的四个选项中选出最佳选项

A

      There are too many cities around the world. And each city needs water in many ways. Water on Earth falls mainly as rain. So the rainfall (降雨量) is important to each part of the world. And it is different from one city to another. The following chart shows the average (平均的) rain fall in four different cities in July and January.

读“20元人民币版面图案”（如图），回答下题．