题目内容
Large dams have harmed Siberia’s delicate _________ balance.
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Under pressure to cut these emissions, which contribute to global warming and climate change, India is turning to its greatest source of clean, _________ energy: sunshine.
The project has made _________ fishery management a challenge, since it requires the close cooperation of numerous national governments.
It feels better to do what one can to reduce _________ and waste, but how much is enough?
Street lamps, _________ signs and floodlit monuments all send light into the atmosphere, obscuring the much fainter stars.
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