When someone talks, everyone is expected to listen, no matter how ______.

A．the person’s speaking may be dull

B．dull the person’s speaking may be

C．may the person’s speaking be dull

D．dull may the person’s speaking be

保险单是投保人与保险人之间订立保险合同的正式书面凭证一般由（）在保险合同成立时签发，并将正本交由投保人收执

A.保险人

B.要约人

C.受益人

D.被保险人