The villagers in the mountain have a firm that they will have a good harvest next year.A

问题补充：

The villagers in the mountain have a firm that they will have a good harvest next year.

A. opinion

B. theory

C. idea

D. belief

答案：

A. opinion

B. theory

C. idea

(答案→)D. belief

解析：考察名词词义辨析。A观点；B理论；C主意；思想；D信念；信仰；句意：大山里的村民们有一个很坚定的信念，明年他们会有一个很好的收获。根据句意说明D正确。