氧气对水生动物来说,属于( )A.地球因子 B.限制因子 C.替代因子 D.一般生态因子

氧气对水生动物来说,属于( )A.地球因子 B.限制因子 C.替代因子 D.一般生态因子

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最重要的温室气体是二氧化碳,其对温室效应的作用( )A.100%以上 B.80%以上 C.50%以上

最重要的温室气体是二氧化碳,其对温室效应的作用( )A.100%以上 B.80%以上 C.50%以上

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王昌龄《从军行》中“黄沙百战穿金甲”的抒情方法是( )A.借典故抒情B.借事抒情 C.借比喻抒

王昌龄《从军行》中“黄沙百战穿金甲”的抒情方法是( )A.借典故抒情B.借事抒情 C.借比喻抒

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Mathew Brady______. A. was very lifelike B. was famous for his unusual pictures C.

Mathew Brady______. A. was very lifelike B. was famous for his unusual pictures C.

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Passage Three More than 6,000 children were expelled (开除) from US school last year for b

Passage Three More than 6,000 children were expelled (开除) from US school last year for b

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