rainfall，they form wide rings.In a dry year，they form narrow ones.

　　Scientists don't have to cut down a pine tree to study its rings.With a special tool，they can remove a narrow piece of wood from the trunk without harming the tree.Then they look at the width of each ring to see how much rain fell in the year it formed.

　　Some pines are hundreds of years old and have hundreds of rings.These rings form an annual record of past rainfall in the southwest.

　　【语篇解读】 本文主要讲了树的年轮。

　　43．We could infer from the story that________.

　　A．a tree grows faster when it has a lot of water

　　B．scientists can cut down trees to study tree rings

　　C．pine trees form wide rings every year

　　D．the ponderosa pine grows in the southwest

　　解析　推理判断题。由第三段第四、五、六句可知答案为A。

　　答案　A

　　44．A tree grows a new layer of wood________.

　　A．each week

　　B．whenever it rains

　　C．every year

　　D．every season

　　解析　细节理解题。由第二段第一句可得到答案。

　　答案　C

　　45．All in all，this story is about________.

　　A．why the tree trunks grow bigger

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