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单选题
A

The lifecycle of trees.

B

The number of trees.

C

The intensity of solar burning.

D

The quality of air.


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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。
更多 “单选题A The lifecycle of trees.B The number of trees.C The intensity of solar burning.D The quality of air.” 相关考题
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考题 生命周期(lifecycle)

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