2. 外语
  3. Changes in climate that had already taken place are manifested 【M1】______ from the decrease in extent and thickness of Arctic se

Changes in climate that had already taken place are manifested 【M1】______ from the decrease in extent and thickness of Arctic se

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问题     Changes in climate that had already taken place are manifested 【M1】______
from the decrease in extent and thickness of Arctic sea ice, permafrost thaw- 【M2】______
ing, coastal erosion, changes in ice sheets and ice shelves, altered distribu- 【M3】______
tion and abundance of species.
    Nowadays snows melt earlier in the springtime. Lakes, rivers and bogs
freeze much more later in the autumn. Reindeer herding becomes more 【M4】______
difficult so the ice is weak and may give way. Nowadays the winters are 【M5】______
much colder than they used to be. Occasionally during winter time it rains. 【M6】______
We never expected this; we could not be ready for this. It is very strange...
The cycle of the yearly calendar has been disturbed greatly. Warming over
northern land areas has been very greater than elsewhere in the world. The 【M7】______
changes are due to human modification of the concentration of greenhouse
gases during the 20th century, leading quite directly to the projections the 【M8】______
Arctic will warm by several times as much during the 21st century as it did
during the 20th century. The amplified warming in Arctic, in turn, directly 【M9】______
contributes to overall global warming, as well as cause changes that create 【M10】______
impacts over the rest of the globe.
【M5】
选项
答案so — as / since
解析 这里要理清主从句的因果关系，从上下文来看，应该说“冰层变薄”是因， “放牧驯鹿变得困难”是果，所以应该把so改成as或since。
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