【C6】A．manneredB．builtC．dressedD．fed

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

The river fed into a lake.（英译中)

A．didB．builtC．triedD．conducted

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

如下哪些矿物元素是动物必需的微量元素（).A.KB.CaC.FeD.Se

呼吸链中起电子传递作用的金属是A.MgB.ZnC.FeD.CO