—Hello, may I speak to Mr Green, please?

—Sorry. He          a meeting. Can you call him later?

A．has

B．is having

C．will have

D．had

打火机是人们生活的日常用品，下图是普通电子打火机的实物示意图，下列说法中不正确的是

A.打火机工作时把化学能转化为热能

B.打火机工作时发生氧化还原反应

C.打火机燃料在通常状况下为液态

D.压电陶瓷是耐高温的新型无机非金属材料