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  3. It is natural that a tree would grow best in a climate with plenty of sunlight and rainfall. It is also expected that little sun

It is natural that a tree would grow best in a climate with plenty of sunlight and rainfall. It is also expected that little sun

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问题     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【11】the growth of a tree. The change from a favorable to an unfavorable【12】can be determined by reading the pattern of rings in a tree trunk (树干). To find out the weather of ten years ago,【13】the rings of a tree trunk from the outside to the inside. If the tenth ring is far from the other rings, then it is【14】that plenty of sunny and rainy weather occurred. If the rings are【15】together, then the climate was bad for the tree.
  
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答案climate
解析 上文讲了气候条件对树木生长的影响，下文说如何由树木的年轮疏密来判断该地的气候变化，也就是说某个地方的气候条件是否适合树木的生长，可以由树干的年轮的疏密来判断。结合录音很容易听出答案为climate。
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