单项选择题

Before the Civil War, Frederick Douglass' editorials for the North Star urged respect for the rights of all people.

A．advocated
B．created
C．foresaw
D．granted
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Machine tools vary in size from handheld devices used for drilling and grinding to large stationary machines that perform a number of different operations.
A．exist
B．expand
C．compare
D．range
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Good health is a family's most valued possession.
A．noticeable
B．useful
C．costly
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