单项选择题

Moving parts of machines and motor vehicles have to be ______ regularly to reduce friction.

A．lubricated
B．fabricated
C．embedded
D．dictated
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单项选择题
The ______ of the space shuttle that had exploded in the air were scattered over a large area.
A．segments
B．fragments
C．elements
D．ornaments
单项选择题
The debate as to which is the best way to lose weight has never come to an end.
A．considering
B．including
C．relating
D．concerning
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