【练习】
Changes in climate that had already taken place are manifested __1
from the decrease in extent and thickness of Arctic sea ice, perma- __2
frost thawing, coastal erosion, changes in ice sheets and ice shelves, altered distribution and abundance of species. __3
Nowadays snows melt earlier in the springtime. Lakes, rivers and bogs freeze much more later in the autumn. Reindeer herding __4
becomes more difficult so the ice is weak and may give way. __5
Nowadays winters are much colder than they used to be. __6
Occasionally during winter time it rains. 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 __7
changes are due to human modification of the concentration of greenhouse gases during the 20th century, leading quite directly to the projections the Artic will warm by several times as much during the __8
21st century as it did during the 20th century. The amplified warming in Arctic, in turn, directly contributes to overall global warming, as __9
well as cause changes that create impacts over the rest of the globe. __10
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