找出划线部分发音与其它三个不同的选项,请标出划线部分的音标
( ) 1.A.each B.heater C.healthy D.easily
( ) 2.A.heard B.dear C.Earth D.learn
( ) 3.A.loud B.cloud C.country D.around
( )4.A.thirty B.fire C.thirsty D.first