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单选题

A. Adverse traveling conditions delayed the courier.
B. The courier needed to hire a guide.
C. The fees of several couriers were included in the charge.
D. The letter contained a valuable item.

参考答案C
解析:What would cause a letter to be expensive to receive?
细节题。讲座提到If the letter passed through many hands before reaching the receiving end.The final bill could be very expensive,即“如果信件需要转手多次才能到达收信者手中,那么费用就会非常高”。因此,正确答案是C。

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