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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【B1】______ the growth of a tree. The change from a favorable to an unfavorable【B2】______ can be determined by reading the pattern of rings in a tree trunk (树干). To find out the weather of ten years ago,【B3】______ 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【B4】______  that plenty of sunny and rainy weather occurred. If the rings are【B5】______ together, then the climate was bad for the tree.
【B1】
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 limit the growth of a tree. The change from a favorable to an unfavorable climate can be determined by reading the pattern of rings in a tree trunk (树干). To find out the weather of ten years ago,count 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 certain that plenty of sunny and rainy weather occurred. If the rings are close together, then the climate was bad for the tree.
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答案limit
解析 短文开头就提到，在阳光雨水充足的条件下，树木自然长得最好，因此如果缺少这些条件的话，则会限制树木的生长。结合录音不难听出limit一词。
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