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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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解析 上文既然提到观察树木年轮的疏密可以了解气候的变化，那么要知道十年前的气候就可以由外向内数出十条年轮. 结合录音填入count。
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