单项选择题

A．diversity
B．generalization
C．extinction
D．degradation
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单项选择题
A．You can buy two bookcases for $ 14.95.B．You can buy one bookcase for $ 7.50 today.C．You can buy two bookcases for $ 9.90 each.D．You can buy two bookcases for $ 7.50 each.
A．You can buy two bookcases for $ 14.95.
B．You can buy one bookcase for $ 7.50 today.
C．You can buy two bookcases for $ 9.90 each.
D．You can buy two bookcases for $ 7.50 each.
单项选择题
A．Look for the traffic light.B．Give her a call.C．Wait a little longer.D．Change the tire for her friend.
A．Look for the traffic light.
B．Give her a call.
C．Wait a little longer.
D．Change the tire for her friend.
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