引起禽伤寒的病原体是（）
A.禽腺病毒
B.禽流感病毒
C.鸡新城疫病毒
D.沙门氏菌
参考答案：D
–Do you think they have as many books as they’ve described?
--Well, in my opinion, they have few books, if ______.
A．some
B．none
C．any
D．many
消防栓应刷（）颜色。
