【语篇导读】本文是夹叙夹议文,告诉我们“远兼如近邻”的道理。5.A【解析】细节理解题。根据第一段 Much morerobably it is a close female friend calling to tell you thatshe has split up with her boyfriend again or perhaps'simply that a good movie has just started on TV,可知最有可能来自一个朋友,故选A。6C【解析】细节理解题。根据第三段 TV shows likethis tell us that our romantic relationships may not lastbut we need to keep in touch with out close friends, ifwant to survive可知 TV shows like Friend告诉我们亲密的朋友帮助我们面对生活中的困难。故选C。7D【解析】推理判断题。根据最后一段 This is trueof Erika and Jane's friendship. With Erikas family 200miles away, it is Jane who keeps a spare set of keys toErika's apartment and waters her plants whenever she isaway.可知Enka和Jane在日常生活中互相信任和支持。故选D。8A【解析】推理判断题。纵观全文,特别是最后一E My friends have more to do with my life than my par-ents and, therefore, 1. don t have to spend a lot of timeexplaining things to them. Friends are more up to datewith what is happening.可知远亲不如近邻。故选A。

20.(10分)(1)334分)Na乎2Na+(1分)(2)与过量的S2结合生成FeS沉淀,防止As2S3与S2结合生成AsS3-(或与S2-结合生成FeS沉淀,使平衡左移,提高沉砷效果)(2分)3)稀硫酸、铁氰化钾溶液(或稀硫酸、高锰酸钾溶液)(2分)(4)2AsO-+2SO2+2H+=As2O3↓+2SO-+H2O(2分)(5)SO2(2分)【解析】(1)砷元素的原子序数为33,Na2S的电子式为Nat[S乎2Na+。(2)“沉砷”中FeSO4的作用是Fe2与过量的S2-结合生成FeS沉淀,防止As2S3与S2结合生成AsS3-或与S2-结合生成FeS沉淀,使平衡左移,提高沉砷效果(3)四氧化三铁中含有+2价铁,具有还原性,证明四氧化三铁存在的试剂为稀硫酸铁氰化钾溶液或稀硫酸、髙锰酸钾溶液(4)调节pH=0时,由Na3AsO4制备A2O3的离子方程式为2AO-+2SO2+2H+==As2O3↓+a2SO2-+H2O5)AsS4中As元素为+2价、S元素为-2价,1 mol As S4参加反应时,转移28mole,则S元素的化合价升高6价,物质a为SO2。

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