单项选择题

Braille, the universally accepted________ of writing used by blind persons, consists of sixty-three characters.

A．catalog
B．system
C．pattern
D．scheme
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单项选择题
He has been on Sam and John________ with me for 17 years.
A．connection
B．terms
C．friendship
D．relations
单项选择题
Young as he is, he is fairly________.
A．practicable
B．permanent
C．portable
D．practical
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