单项选择题

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

A．mode
B．system
C．pattern
D．scheme
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单项选择题
The Hudson River School was the name of the first group of American artists to develop a characteristic style of ______ painting,
A．territory
B．landscape
C．groundwork
D．region
单项选择题
It is reported that there is no better ______ for mother's milk.
A．alternative
B．equivalence
C．exchange
D．substitute
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