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
Our house is about two kilometers from the middle school and there are not many houses________.
A．in between
B．far apart
C．among them
D．from each other
单项选择题
Our taste for fat and sugar appears to have________ from our ancestors.
A．carried
B．stemmed
C．succeeded
D．rooted
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