According to the passage, the Muir Glacier has retreated because ______. The snowline’s retreat means that it is getting ______

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问题 According to the passage, the Muir Glacier has retreated because ______.
The snowline’s retreat means that it is getting ______.

选项 A、higher
B、lower
C、wider
D、narrower

答案A

解析 根据第一段最后两句“Secondly,rising temperatures have been causing the snowline to retreat on mountains all over the world.In Peru,for example,it has risen as much as 2,700 feet in 60 years”本句中retreat和risen是相对应的,所以A选项符合题意,故为正确答案。
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