Directions:Ineachofthefollowinggroupsofwords,therearcfourunderlinedlettersorlettercombinations
markedA,B,CandD.Comparetheunderlinedpartsandidentifytheonethatisdifferentfromtheothersin
pronunciation.Markyouranswerbyblackeningthecorrespondingletterontheanswersheet.
1.
A.tr ail
B.certain
C.again
D.faint
正确答案：B
