According to the passage, the Muir Glacier has retreated because ______. Vegetation in Canada has shifted northward because ___

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问题 According to the passage, the Muir Glacier has retreated because ______.
Vegetation in Canada has shifted northward because ______.

选项 A、there isn’t enough water in southern Canada
B、the temperature is stable in northern Canada
C、there are much more fields in northern Canada
D、the temperature is much lower in northern Canada

答案D

解析 第二段开始提到“温度升高的结果使蔬菜种植地区发生了变化,在加拿大,农业的耕种线向北移动了50到100英里”,因为温度的升高,而北部地区的温度比较低,所以适合种植,因而耕种线向北移动,符合题意的是答案D。
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