单项选择题

The plumb line is always perpendicular ______ the horizontal plane.

A．with
B．from
C．at
D．to
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单项选择题
Just as the veteran worker is skilled in the handling of machine, ______ the experienced writer is skilled in the handling of his words.
A．as
B．so
C．thus
D．like
单项选择题
______ is human nature, that people don't cherish the things they have until they lose it.
A．It
B．Such
C．That
D．This
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