The main subject of this passage is the______. In Mr. Manser’s opinion, the main stumbling block to the development of hydro-el

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问题 The main subject of this passage is the______.
In Mr. Manser’s opinion, the main stumbling block to the development of hydro-electric power is the______.

选项 A、capital outlay.
B、running cost.
C、public expenditure.
D、financing risk.

答案A

解析
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