When Peter speaks in public, he always has difficulty ______ the right things to say.

A．thinking of

B．to think of

C．thought of

D．think of

普鲁卡因局麻后患者出现恐惧、恶心，呼吸困难、烦躁不安，健谈、呕吐、面肌抽搐，四肢肌肉振颤，血压下降，可能出现了

A．普鲁卡因过敏
B．晕厥
C．肾上腺素反应
D．普鲁卡因中毒
E．癔病