单项选择题

A．He wanted to reserve the photographs for himself.
B．He was unable to reproduce them in the early 1900’s.
C．He regarded each photograph as unique.
D．He was frustrated in his revolutionary effort.
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单项选择题
A．The speakers would use too much power.B．The speakers would decrease the quality of the sound.C．The headphone would be a lighter replacement.D．The recording mechanism could take the place of speakers.
A．The speakers would use too much power.
B．The speakers would decrease the quality of the sound.
C．The headphone would be a lighter replacement.
D．The recording mechanism could take the place of speakers.
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