语音知识（共5小题，每小题1分，满分5分）
radiation  

A．category

B．persuade

C．lack

D．contrary

style      A. ugly       B. yellow     C identify  D. yesterday
worth     

A．breath

B．bathes

C．though

D．southern

example   

A．experience

B．exhibition

C．examine

D．exercise

discourage 

A．route

B．dangerous

C．wound

D．trouble