According to the passage, the Muir Glacier has retreated because ______. What is the cause of all these phenomena? ______.

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问题 According to the passage, the Muir Glacier has retreated because ______.
What is the cause of all these phenomena? ______.

选项 A、Melting glaciers.
B、Rising temperature.
C、Snow line.
D、Dying trees.

答案B

解析 整篇文章一直在谈论温度升高产生的影响,选项A、C、D都是其产生的结果,B表明原因所以正确答案为选项B。
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