单项选择题

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单项选择题
______is particularly harmful to photographic materials.
A．Cignin
B．Bleach
C．Acid
D．Chemical whiteners
单项选择题
A．He did not spend money freely.B．He was always well-dressed.C．He had a luxurious car.D．He worked hard for a living.
A．He did not spend money freely.
B．He was always well-dressed.
C．He had a luxurious car.
D．He worked hard for a living.
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