语音知识（共5小题，每题1分）
abandon   

A．dangerous

B．balance

C．female

D．advanced

achieve     

A．chemist

B．technique

C．stomach

D．research

concept     

A．musician

B．medicine

C．secure

D．special

bond       

A．ocean

B．opposite

C．income

D．approve

sweat       

A．break

B．least

C．bread

D．weak