Either you or he _____ interested in playing chess. _____ you or he fond of music at present?

A．are; Are

B．is; Are

C．are; Is

D．is; Is

不安全因素中的自然因素包括（）。

A、地理条件和气候条件的影响

B、地震和台风的影响

C、气温和天气的影响

D、工作环境和场地的影响