I hear a number of workers in the factory _____ out of work and the number of them  ______ quite large .   

A． are , is

B．is , are

C．is , is

D．are, are

普萘洛尔的禁忌证是

A．快速型心律失常

B．心绞痛

C．原发性高血压

D．甲状腺功能亢进

E．支气管哮喘