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举一反三
【单选题】Desperately short of living space and dangerously prone to flooding, the Netherlands plans to start building homes, businesses and even roads on water. With nearly a third of the country already cover...
A.
most parts of the country are covered by water
B.
the country is constantly threatened by floods
C.
it will promote the cultivation of flowers
D.
people think it better to live on water
【单选题】下列有关物质分类正确的是①合物：盐酸、王水、水玻璃、水银②化合物：CaCl2、烧碱、聚苯乙烯、HD③电解质：H2SO4、胆矾、冰醋酸、硫酸钡④同素异形体：C60、C70、金刚石、石墨
A.
①③
B.
②④
C.
②③
D.
③④