单项选择题

Questions 18-21 are based on the following passage.
What was the black walnut wood used for in World War I

A．It was used to make cabinets.
B．It was used in making cigarette filter.
C．It was used in making gun stocks.
D．It was used to make fences.

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单项选择题

单项选择题

Questions 18-21 are based on the following passage. What was the black walnut wood used for in World War I 您的浏览器不支持 audio 元素。