单项选择题

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

A．pattern
B．catalog
C．system
D．scheme
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单项选择题
Being objective and modest, a scientist must not ____________ his view on others.
A．apply
B．import
C．impose
D．approve
单项选择题
My uncle was crippled in middle age in a traffic accident and had to ____________ riding.
A．give out
B．give off
C．give up
D．give in
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