单项选择题

A．Orlon.
B．Artificial silk
C．Linen.
D．Fur.
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单项选择题
A．Science is less advanced than medicine.B．Philosophy is more useful than science.C．Science is ahead of philosophy.D．Science is more useful than philosophy.
A．Science is less advanced than medicine.
B．Philosophy is more useful than science.
C．Science is ahead of philosophy.
D．Science is more useful than philosophy.
单项选择题
A．With their parents.B．With baby-sitters.C．With other babies.D．With the adults they know.
A．With their parents.
B．With baby-sitters.
C．With other babies.
D．With the adults they know.
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