单项选择题

A．reason
B．notice
C．warning
D．signal
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单项选择题
A．strainB．worryC．painD．trouble
A．strain
B．worry
C．pain
D．trouble
单项选择题
A．Light darkens silver salt.B．Light darkens natural salt.C．Light darkens silver.D．Light darkens self-developing film.
A．Light darkens silver salt.
B．Light darkens natural salt.
C．Light darkens silver.
D．Light darkens self-developing film.
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