英语周报八年级下册是第44答案

第三节书面表达One possible version:Dear PeterHow about your life? I am writing to convey my grati-de for your kind help and care during my stay in yourcountry, without which I wouldnt have enjoyed itmuchGuided by you, I had a chance to visit some places ofinterest in England and experience such unique culture aswell as beautiful scenery. Thanks to your generous help, Ido believe that I have a better understanding of your countryand culture. What's more, during the week, the comfortable room, delicious meals and especially your friendlyfamily made me feel at homeI will be more than pleased if I have the opportunity to"repay your kindness. I will show you around in China. I amlooking forward to your coming.YoursLi H

12:B【解析】由表中数据可知,酸性:H2B>HA>HB-,则水解程度:B2>A->HB-,故相同浓度溶液的pH:pH(Na2B)>pH(NaA)>pH(NaHB),A项错误;Kb(A-)10-14K.(HA)1.7×106≈5.9×10° c(Na ),B项正确;酸性H2B>HA>HB,故反应的离子方程式为B2HA一A- HB,C项错误;K(B=10-141.3×10-57.7×10 c(HB)>c(B2)>c(H2B),D项错误。

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