【C6】A．manneredB．builtC．dressedD．fed

The bridge ______ two years ago.A、was builtB、builtC、is built

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The river fed into a lake.（英译中)

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A．didB．builtC．triedD．conducted

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______with resting at home, he decided to find a job.A．Fed upB．Feeding upC．To be Fed upD．H

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如下哪些矿物元素是动物必需的微量元素（).A.KB.CaC.FeD.Se

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呼吸链中起电子传递作用的金属是A.MgB.ZnC.FeD.CO

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与十进制数511等值的十六进制数为A.1FFB.2FFC.1FED.2FE

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