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光在真空中的传播速度是__________m/s。太阳、月亮、荧火虫、其中不是光源的是_________。
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自今年墨西哥发现首例甲型H1N1流感患者后,在世界多个国家都有发现病例。甲型H1N1流感病毒是引起该病的病原体,下列表明该病毒属于生物的是 [ ]
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If the dog hadn’t woken us, we wouldn’t have noticed the fire and it _____ to the house next door.
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Have you seen Tom recently? I wonder ______ with his students.
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would you like to sweep the floor?同义句
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