单项选择题


A．time
B．speed
C．fuel
D．performance
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单项选择题
A．ofB．withC．inD．from
A．of
B．with
C．in
D．from
单项选择题
According to the passage, a life preserver should be first of all ______.
A．adjustable
B．comfortable
C．self-evident
D．self-righting
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