单项选择题

A．Instructions that come with a product.
B．The quantity of a product.
C．The quality of a product.
D．Warranties that cover a product.
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单项选择题
A．The poor.B．The unemployed.C．The old.D．The young.
A．The poor.
B．The unemployed.
C．The old.
D．The young.
单项选择题
A．In cold zones.B．In hot zones.C．In temperate zones.D．Any climate.
A．In cold zones.
B．In hot zones.
C．In temperate zones.
D．Any climate.
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