题目

Poverty exists because our society is an unequal one, and there are plenty of political pressures to keep it that way. Any attempt to redistribute wealth and income in the United States will be opposed by powerful middle and upper class interests. People can be relatively rich only if others are relatively poor, and since power is concentrated in the hands of the rich, public policies will continue to reflect their interests rather than those of the poor.As Herbert Gans has pointed out, poverty is actually functional form from the point of view of the non-poor. Poverty ensures that ‘dirty’下列有关物质的名称、俗名、化学式中，三者皆指同一物质的是（ ）A．氧化钙、消石灰、CaOB．氯化氢、盐酸、HClC．碳酸钙、熟石灰、CaCO3D．氢氧化钠、烧碱、NaOH