[单选题]货车斜楔主摩擦板由高分子复合材料的耐磨层和（ ）组成。
A.超强层
B.减震层
C.高强层
D.增强层

收入差距现象是一把双刃剑，对社会经济发展的作用具有[a]二重性，即合理、合法且适度的收入差距具有积极意义，而不合理不合法且过大的收入差距会带来消极影响。现在，有人对收入差距问题产生了一些思想困惑，有的甚至提出了收入差距的产生和扩大是了积极性，还是[c]了积极性，是改革成功的标志，还是改革失败的表现，是奔向共同富裕，还是走向“两极分化”等种种疑问。对此，我们必须加以科学分析。我国现阶段的收入差距现象是在由计划经济向市场经济过渡的过程中出现的，是打破平均主义分配方式、强调市场竞争的必须产物。[d]是通过诚实劳动和守法经营而产生的收入差距，[e]具有合理合法性；只要收入差距对社会经济所产生的负效用小于刺激生产力发展的正效用，就是适度的。实践证明，合理、合法且适度的收入差距具有多方面的积极意义。

For most companies today, getting into new markets with better, cheaper products, whether through an expansion or a new facility, is the sole objective. But (1) that, and doing it profitably means (2) and foremost knowing you will find the workforce.
The current nearly eight-year-long economic (3) has sent unemployment levels in the U.S. to (4) lows. Indeed, according to a recent study, some 80 percent of metropolitan areas today have unemployment rates (5) 6 percent; communities with highly skilled workers are hovering in the 2 to 4 percent range. Also (6) for that labor are foreign companies that have been operating here and want to expand.
(7) so many companies chasing the workforce, the (8) are high. The most important issue facing corporations is the (9) of qualified, entry-level labor at (10) wage rates.
But getting large groups of existing employees to (11)
A. regulate
B. reverse
C. relocate
D. respond