单项选择题
A.The CD is defective.
B.The CD is not bootable.
C.The CD-ROM drive is defective.
D.The Boot Sequence is not set in the BIOS to boot first from the CD
单项选择题 WhichofthefollowingisNOTaphaseofthetroubleshootingprocess？（）
单项选择题 WhatistheFIRSTandmostimportantstepinsystemtroubleshooting？（）
单项选择题 AdefectiveCD-ROMdriveisreplacedwithanewCD-ROMdrive.ThenewCD-ROMdriveisabletoreadanyCDthatitaccesses，butmusicCDsdonotplaymusic.WhatistheMOSTlikelycauseofthisproblem？（）