单项选择题

A．Since he was born.
B．Since his early childhood.
C．Two years.
D．Two months.
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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
The passage is mainly about ______.
A．the uses of life preservers
B．the design of life preservers
C．the materials for life preservers
D．the buoyancy of life preservers
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