单项选择题

What is the author's attitude toward the single agent service

A．Critical.
B．Doubtful.
C．Positive.
D．Indifferent.
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单项选择题
What did the Arabian Empire control
A．The routes of the caravans.
B．The management of the caravans.
C．The expenses of the caravans.
D．The modes of transportation.
单项选择题
Which statement does NOT describe the caravan trade
A．Caravan trade started in the Middle East.
B．Caravan trade was well developed before sea trade.
C．Caravans were well organized.
D．Caravans were protected by local governments.
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