问题
单项选择题
What function of the wholesaler is compared to a valve
A．Controlling the flow of goods.
B．Pushing up demand from retailers,
C．Beating part of the risk for manufacturers.
D．Selling goods to retailers.
答案
参考答案：A
解析：[分析] 推断题型。 从第三段的第一句话The manufacturer can then keep up a steady production flow， and the retailer has no need to hold heavy stocks, who can call on the wholesaler for supplies any time．可推断出答案。