What does the speaker say about lumber companies? A．There will be a shortage of lumber within 4 months. B．Their revenues dropped by 21 percent in the last 12 months. C．They are being supported by new research methods. D．There will be healthy competition for the next two years.
A.There B. B．Their C. C．They D. D．There
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D 解析：文中说，各家木材公司之间正在发展良性竞争，并说这样的现象“is expected to continu......