扁平颗粒胶片的感光材料为（）
A.AgCI
B.AgBr
C.Agl
D.AgF
E.AgBr＋Agl
参考答案：B
______ number of visitors were shocked by _____ number of the butterflies(蝴蝶) around the huge tree.
A．A; a
B．The; the
C．The; a
D．A; the
真倾角
