单选题ATo examine the chemical elements in the Ice Age.BTo look into the pattern of solar wind activity.CTo analyze the composition of different trees.DTo find out the origin of carbon-14 on Earth.
单选题
A
To examine the chemical elements in the Ice Age.
B
To look into the pattern of solar wind activity.
C
To analyze the composition of different trees.
D
To find out the origin of carbon-14 on Earth.
参考解析
解析：
细节题。从录音结尾来看，科学家的主要目的是通过对树木年轮的考查来研究“solar wind activity”。
细节题。从录音结尾来看，科学家的主要目的是通过对树木年轮的考查来研究“solar wind activity”。
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