60．The text mainly describes Rania as ____．

　　A．a caring mother

　　B．a fashion model

　　C．a social activist

　　D．a smart businesswoman

　　【答案解析】E

　　If you can find a tree which has been cut down, you will see many rings, or circles, on the base of the trunk (树干基部). By learning to read these rings, you can find out about the tree's life.

　　The number of rings tells you how old the tree is. Each year, new wood is formed on the outside of the tree. This new wood is light in colour when the tree is growing in spring and summer, and dark in winter when the tree is not growing much. So, if you count the rings of dark-or-light-coloured wood, you can often find out how old the tree is.

　　You can also tell which years have been good years and which years have been bad years. When the light-coloured rings are very wide, it means that the tree has been growing quickly that year. If the light rings are narrow, it has been growing slowly. If the rings on a tree trunk were greatly magnified (放大), you would be able to see why the rings are light-coloured when the tree is growing quickly, and dark-coloured when the tree is growing slowly. The tree trunk is made up of microscopic tubes (毛细管), like long pipes, carrying water from the soil, through the trunk, and up to the leaves. They are wide and thin-walled when the tree is growing quickly and they are carrying a lot of water. They are narrow and stuck together when the tree is not growing so quickly.

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