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【单选题】

For the last hundred years the climate has been growing much warmer. This has had a number of different effects. Since the beginning of the 20th century, glaciers (冰河) have been melting very rapidly. For example, the Muir Glacier in. Alaska has retreated 2 miles in 10 years. 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.
As a result of this, vegetation has also been changing. In Canada, the agricultural crop line has shifted 50 to 100 miles northward. In the same way cool-climate trees like birches and spruce have been dying over large areas of Eastern Canada. In Sweden the tree line has moved up the mountains by as much as 65 feet since 1930.
What is the cause of all these phenomena ______.

A.
Melting glaciers.
B.
Rising temperature.
C.
Snow line.
D.
Dying trees.
题目标签:冰河
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【单选题】Task 2Directions: This task is the same as Task 1.The 5 questions or unfinished statements are numbered 41 through 45.The world is not only hungry; it is also thirsty for water.This may seem strange t...

A.
the world has not enough fresh water to meet our future needs
B.
people all over the world are thirsty for water now
C.
we are now facing a serious problem of worldwide water shortage
D.
people in the world all feel hungry and thirsty

【单选题】For the last hundred years the climate has been growing much warmer. This has had a number of different effects. Since the beginning of the 20th century, glaciers (冰河) have been melting very rapidly. ...

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
相关题目:
【单选题】Task 2Directions: This task is the same as Task 1.The 5 questions or unfinished statements are numbered 41 through 45.The world is not only hungry; it is also thirsty for water.This may seem strange t...
A.
the world has not enough fresh water to meet our future needs
B.
people all over the world are thirsty for water now
C.
we are now facing a serious problem of worldwide water shortage
D.
people in the world all feel hungry and thirsty
【单选题】2011年12月12日,新疆哈巴河县额尔齐斯河边气温为零下13℃左右,河中央约有10米间距尚未封冻,冰河中流凌聚集成团状,景象壮观。 下列关于额尔齐斯河的叙述,不正确的是( )
A.
2011年该河流域寒潮、暴雪、大风等灾害性天气频繁
B.
河流近岸处水浅且受陆地温度变化的影响较大而首先冰冻
C.
该河以湖泊水、地下水补给为主
D.
流凌可能在下游堆积形成凌汛
【单选题】For the last hundred years the climate has been growing much warmer. This has had a number of different effects. Since the beginning of the 20th century, glaciers (冰河) have been melting very rapidly. ...
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
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