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.
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单项选择题
A) 1727. B ) 1839. C) 1823. D) 1860.
A) 1727. B ) 1839. C) 1823. D) 1860.
单项选择题
A．He is the girl’ s friend.B．He is the girl’ s father’ s old friend.C．He is the girl’ s teacher.D．He is the girl’ s uncle.
A．He is the girl’ s friend.
B．He is the girl’ s father’ s old friend.
C．He is the girl’ s teacher.
D．He is the girl’ s uncle.
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