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Some renewable energy technologies are quite ____________: for example, hydro power from dams and rivers has been a source of power generation since the early 1900s, and today it supplies sixteen percent of electricity worldwide.
- A.inexpensive
- B.effective
- C.mainstream
- D.conventional
- E.influential
- F.appealing
C,D显示答案
以上解析由 考满分老师提供。
