题目内容：
By saying “the rewards of a man’s industry follow with equal steps the progress of his labor” （Line 10，Para． 1），the author means （ ）．
A．the more diligent one is，the bigger his returns B．laborious work ensures the growth of an industry
C．a man’s business should be developed step by step
D．a company’s success depends on its employees’ hard work
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答案解析：