题干

面对各地高发的酒后驾车恶性事件,公安机关已经采取措施,以“零容忍”的姿态重拳整治。交通警察使用的一种酒精检测仪中装有重铬酸钾(K2Cr2O7),它对酒精非常敏感,该化合物中铬元素(Cr)的化合价为(   )

A:+3

B:+4

C:+5

D:+6

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答案(点此获取答案解析)

D

同类题5

阅读理解

    The 4-year-old boy was mentally disabled, unable to speak in complete sentences and unable to play with other children because of his violent fits(发作) of hitting and biting.

    The decision facing one Brooklyn jury(陪审团)was how much a landlord should pay in damages to the boy — named “G.M.M.” in court documents — after an investigation showed he had been living in an apartment illegally coated with lead paint.

    Attorneys(律师) representing G.M.M. said $3.4 million was the right number, arguing that the boy would have had a bright career ahead of him; both of his parents had graduated from college and his mother received a master's degree. But the landlord's defense put the figure at less than half that — $1.5 million. Attorney Roger Archibald noted that because the boy was Hispanic, G.M.M. was unlikely to attain the advanced education that would provide to such a large income.

    The 4-year-old's case is a rare public look at one corner of the American legal system that explicitly uses race and gender to determine how much victims or their families should receive in compensation(赔偿) when they are seriously injured or killed.

    As a result, white and male victims often receive larger awards than people of color and women in similar cases. These differences largely derive from projections of how much more money individuals would have earned over their lifetimes had they not been injured — projections that take into account average earnings and employment levels by race and gender.