单项选择题


A．fuel
B．speed
C．range
D．cost
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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
单项选择题
What would happen if a person were supported by the life preserver in a wrong position
A．The waves would move him backwards.
B．The water would choke him.
C．He would immediately sink to the bottom.
D．He might be exhausted or unconscious.
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