化石是最有说服力的生物进化证据．始祖鸟和孔子鸟等化石证实现在的鸟类起源于古代（　　）

A．鱼类

B．两栖类

C．爬行类

D．哺乳类

Please do not be ______ by his bad manners since he is merely trying to attract attention.

A．disgusted

B．embarrassed

C．irritated

D．shocked