题目

Uncle Tom’s Cabin was the best-selling novel of the 19th century, and the second best-selling book of that century, following the Bible. It is credited with helping fuel the abolitionist cause in the 1850s. In the first year after it was published, 300,000 copies of the book were sold in the United States alone.The strength of Uncle Tom’s Cabin is its ability to show slavery’s effect on families. Stowe’s characters freely debated the causes of slavery, the Fugitive Slave Law(逃亡奴隶法), the future of freed people, what an individual could do, and racism. In the 1950s, poet Langst下图为实验室制取氢气的发生装置．若液面刚好不与锌粒接触而又无酸液可加，要得到氢气，可从长颈漏斗中加入的适量试剂是（ ）①食盐水；②硫酸钠溶液；③氯化钡溶液；④碳酸钠溶液．A．①②③B．①②④C．②③④D．①③④