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A．When they are walking alone in the street.B．When they are trying to locate a chair.C．When they do not have a cane or dog.D．When there is construction or a lot of noise around.
A．When they are walking alone in the street.
B．When they are trying to locate a chair.
C．When they do not have a cane or dog.
D．When there is construction or a lot of noise around.
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