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  3. Losing amphibians means losing Scientists think that the decline of amphibians could

Losing amphibians means losing Scientists think that the decline of amphibians could

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问题 Losing amphibians means losing
Scientists think that the decline of amphibians could
选项 A、cause environmental change.
B、cause a decline in other kinds of animals.
C、be a warning signal for human beings.
D、be a good sign for human beings.
答案C
解析
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