【题目】Don't waste words on him. He is so ______ that you can't expect him to change his mind.
A.stubborn
B.merciful
C.modest
D.sincere

【答案】A
【解析】考查形容词。A. stubborn 固执的；B. merciful怜悯的，同情的；C. modest谦虚的；D. sincere真诚的。句意：不要在他身上浪费口舌了。他是如此的固执以致于你不能指望他会改变他的想法的。故选A。