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题目内容
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.
- Ainexpensive
- Beffective
- Cmainstream
- Dconventional
- Einfluential
- Fappealing
C,D显示答案
以上解析由 考满分老师提供。