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15.D由电路图可[文]知，闭合开关S、S[章],灯泡与定值电阻R[来]并联，电流表A测干[自]路电流，电流表A,[知]测电阻R的电流，电[嘛]压表测电源电压；再[答]断开S,时，电路为[案]电阻R的简单电路，[网]电流表A、A,均测[文]电阻R的电流，电压[章]表测电源电压，所以[来]电压表示数不变，故[自]B错误；断开S,时[知]电压表V与电流表A[嘛],的示数之比为电阻[答]R的阻值，所以比值[案]不变，故A错误：断[网]开S,前，灯泡与电[文]阻R并联，如果R短[章]路，灯泡也短路，不[来]能正常发光，故G错[自]误；由于并联电路中[知]，干路电流等于各支[嘛]路电流之和，所以断[答]开S时电路变成了只[案]有电阻R的电路，而[网]电阻R中电流不变，[文]即电流表A的示数变[章]小，故D正确。
【答案】We sat down next to each other..bu[来]t David wouldn't look at me.I said gently and quietly,"No one can change your mind,exce[自]pt yourself.[知]If you desire to challenge[嘛] yourself,[答]there isnothing[案] to do with others'thoughts.[网]"He sat still with a deep breath."You have a full preparati[文]onbefore this event,whi[章]ch is the most important[来] reason why you show up here",I added with asincere tone.Hear[自]ing my words,Dav[知]id turned to me trembling[嘛]ly with tears spilling out of his eyesand expressed[答] he had made a firm determina[案]tion to finish the cross-cou[网]ntry run.His coach heardwhat[文] David saidand gave me a look-the kind that was more determine[章]d than anyone else's.I watched as David moved up to the starting line with the other runners.T[来]he race started.I[自]tseemed that the runway was extremely[知] long for young children,[嘛]not to mention a child with a heartdise[答]ase.David[案] insisted on running as if he had forgotten[网] all his weaknesse[文]s,though he was trippedov[章]er within the a few kilometer[来]s.It didn't take long before he picked himself up again andcontin[自]ued his mission.C[知]lassmates[嘛] all appeared on the racing track,che[答]ering for him."Come on!You can make it!We are proud of you!"they shouted enthusias[案]tically.T[网]o everyone's joy,herea[文]ched the final line and ranked the 20th.It was no more important[章] whether he won the first placeor not.It was his brave heart and strong faith that could make something[来] unusual happen finally.
