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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.
【B4】
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.
选项
答案certain
解析 从前文可知，如果气候适宜，树木会长得比较快，那么该树这一年的年轮与其他年轮的间距就会宽些。换而言之，如果年轮间的距离宽，则说明阳光雨水充足，因此填certain。
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