What is the only foreseeable threat to the lumber industry?
A．The cost of cutting down large trees.
B．The threat of the spruce budworm.
C．The rising number of imported workers.
D．The lack of physically fit employees.

A.The
B.
B．The
C.
C．The
D.
D．The

【参考答案】

B
解析：文中说，威胁木材产业的因素是“the possibility of the spruce budwo......

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