单项选择题

According to the passage, the age range of some businesses' customers may be limited because of _____.

A．social/cultural factors
B．economic factors
C．legal/political factors
D．factors of state
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单项选择题
The Anglo-Saxons began to settle in Britain in _____ century.
A．the 4th
B．the 5th
C．the 6th
D．the 7th
单项选择题
Romanticism as a literary movement came into being in England early in the latter half the _____ century.
A．16th
B．17th
C．18th
D．19th
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