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单选题

Question 21 is based on the recording you have just heard.

A
The melting Arctic ice has drowned many coastal cities.
B
Arctic ice is a major source of the world’s flesh water.
C
Arctic ice is essential to human survival.
D
The decline of Arctic ice is irreversible.
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答案：

D

解析：

21 What does Cambridge scientist Peter Wadhams say in his study?

解析：D。对话中女士指出，Peter Wadhams认为北极冰的减少不可逆转，D选项是对录音内容的复现，为正确答案。A选项“融化的北极冰已经淹没了很多沿海城市”、B选项“北极冰是世界淡水的主要来源”和C选项“北极冰对人类生存至关重要”均未提及，排除。

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