问 GMAT63篇阅读 的 第42篇 牛人解答！

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问 GMAT63篇阅读 的 第42篇 

Excess inventory, a massive problem for many busi- nesses, has several causes, some of which are unavoidable. Overstocks may accumulate through production overruns or errors. Certain styles and colors prove unpopular.

题有7个，答案只有6个，请教正确答案！