根据课文内容,完成下列短文。

     When   1   ( compare) with most natural changes, that the temperature of the earth rose about one degree

Fahrenheit during the 20th century is quite shocking. And it's human activity   2   has caused this   3   (全球

的)warming rather   4   a random but natural   5   (现象): Dr Janice Foster explains that we add huge   6   of

extra carbon dioxide to the atmosphere by burning fossil fuels. From the second   7   (图表) and the discovery

of Charles Keeling, all scientists believe that the burning of more and more fossil fuels has resulted   8   the

increase in carbon diox ide. Greenhouse gases continue to build up. Some think that the trend would be a   9   (灾难). On the other hand, George Hamb ley  10   (声明) that more carbon dioxide would encourage a greater

range of animals and bring us a better life.

中国社科院知名学者白钢在《中国政治制度史》中说：“元朝的行省实际上是封建中央集权分寄于地方……它负责处理境内政治、军事、经济等各类事务。此外行省还有一个重要职能是聚集境内财富，以供中央需要。行省的治所往往就是完成这种职能的‘中转站’。”对材料理解准确的是（）

A.行省制必然导致地方势力膨胀

B.行省制下地方权力相对较大

C.行省制体现了分权与制衡原则

D.行省是元朝最高的行政机构