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  3. Losing amphibians means losing Coal miners once used the canary bird to detect

Losing amphibians means losing Coal miners once used the canary bird to detect

admin2009-06-15  26
问题 Losing amphibians means losing
Coal miners once used the canary bird to detect
选项 A、poisonous gases.
B、air pollution.
C、water leakage.
D、radiation.
答案A
解析
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