单选题AThe lifecycle of trees.BThe number of trees.CThe intensity of solar burning.DThe quality of air.
单选题
A
The lifecycle of trees.
B
The number of trees.
C
The intensity of solar burning.
D
The quality of air.
参考解析
解析：
细节题。根据录音“carbon 14 levels change with the intensity of solar burning”，可知选C项。
细节题。根据录音“carbon 14 levels change with the intensity of solar burning”，可知选C项。
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