Energy is obtained from rivers by______.
- A building bridges across them
- B driving generators into them
- C building dams across them
- D directing them into homes and factories
搜答案，更轻松！
Energy is obtained from rivers by______.
54．答案为B 此题为细节题。从文章中的第四段第二句Man constructs...and get the energy needed to drive generators可以得知河水通过推动发电机运转获得电力能源。