从卫星照片上,我们会发现一片片像铁锈一样的棕色地块。它们是工厂、仓库搬迁后留下的被污染的土地,因其颜色而得名为“棕地”。我国大约有30多万块“棕地”需要治理,这给我们的启示有( )
A. ①②④
B. ②③④
C. ①②③
D. ①③④
查看答案
“InAfrica,everyfiveseconds,achilddiesofstarvation”,whichtypeofopeningdoesitbelongto?
A. Startlingfacts,numbersanddata
B. Questions
C. Vividstories
D. Quotation
Ifthetopicis“TheEvolutionalongwithHistoryofBatmanasaHeroicFigure”,whichpatternwouldbethemostsuitableone?
A. Chronologicalpattern
B. Climacticpattern
C. Spatialpattern
D. Cause-effectpattern
等值连接不必在结果中去掉重复的属性。()
A. 对
B. 错