A. lossB. operationC. pressureD. movement

【B10】A．lossB．difficultyC．tragedyD．misfortune

A．your operationB．is your operationC．your operation isD．will your operation

A．at a lossB．at lastC．in groupD．on the occasion

__________ 查看材料A.exerciseB.operationC.dietD.activit

【C18】A．effectB．operationC．useD．power

Once you are up to around 140 decibels, you will______.A．suffer from hearing lossB．feel pa