阅读理解
A
Do you know anything about the history of weather? Don’t look at the sky．Don’t look for old weather reports．Looking at the tree rings is more important．Correct weather reports date back only one century, but some trees can provide an exact record of weather even further back．
It is natural that a tree would grow best in a climate with plenty of sunlight and rainfall． It is also expected that little sunlight or rainfall would reduce the growth of a tree．The change from a favorable to an unfavorable climate can be found out by the reading pattern of rings in a tree trunk．To find out the weather of ten years ago, you can count the rings of a tree trunk from the outside to the inside．If the tenth ring is far from the other rings,
