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15.A【解析】P[文]TH是激素，发挥作[章]用后会被灭活，而钙[来]离子是无机盐离子，[自]不存在灭活现象，A[知]项错误；血钙浓度下[嘛]降使PTH分泌增加[答]，而PTH分泌增加[案]后又会使血钙浓度回[网]升，故血钙浓度的调[文]节过程中存在负反馈[章]调节，B项正确；P[来]TH分泌增加可促进[自]骨钙释放和肾小管对[知]钙的重吸收，故骨细[嘛]胞和肾小管上皮细胞[答]是PTH作用的靶细[案]胞，C项正确；钙离[网]子通过体液的传送调[文]节PTH的分泌，属[章]于体液调节，PTH[来]为激素，对血钙浓度[自]的调节也属于体液调[知]节，D项正确。
第二节One possible version:M[嘛]om did not say anything and she kept reading.D[答]avid wasn't sure if she had heard him or not.So hecalled for help again,but[案] Mom still seemed lost in her books.The[网]n David realized maybe it was time for him topick up the toy train.He quietly picked it up and put it in the box.To his delight,h[文]e found that it was mucheasie[章]r to do it by himself than ask for help.Inst[来]ead of going upstairs,[自]David went to the sofa where Mom was reading.H[知]e sat down beside her andasked his mother whether she would remind him to put his dirty socks in the basket tomorrow if he left them onthe floor again.Mom[嘛] put down her book and promised that she would.Sin[答]ce then,Davi[案]d not only put his dirtysock[网]s in the basket,he[文] also cleaned up the crumbs from the table after dinner,ev[章]eryday.
