患者因怕热、多汗、心悸、甲状腺肿大等诊断为甲亢，心电图检查心律失常，最常见的心律失常是( )

A．房性早搏

B．房颤

C．室性早搏

D．交界性早搏

E．房扑

They didn't do             to stop pollution. [ ]

A. something

B. anything

C. nothing

D. everything