请问The economist believes that it is very important to balanc

请问The economist believes that it is very important to balance
The economist believes that it is very important to balance production and demand in every new field on a global ____,and keep the price of energy stable.
A degree B extent C scale D amount

选择 C scale
解析：这道题主要考查与介词搭配的知识点及其在句子中所含的意思——
1、本题的意思是：经济学家认为每一种新的领域里在全球范围内保持生产和需求平衡的并保持能源价格稳定是十分重要的.
2、各项与介词的搭配如下：
A.to a global degree.在全球范围内/大规模地——介词与原题不符
B.to a global extent 达到世界规模程度地上/在全球范围内——介词与原题不符
C.on a global scale 在世界规模上/在全球范围内——与原题相符
D.to the amount 总数上达到——意思上与原题不符.

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