蓉城名校联盟2021-2022学年下期高中2020级期末联考英语试题答案

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15.D由电路图可知，闭合开关S、S,灯泡与定值电阻R并联，电流表A测干路电流，电流表A,测电阻R的电流，电压表测电源电压；再断开S,时，电路为电阻R的简单电路，电流表A、A,均测电阻R的电流，电压表测电源电压，所以电压表示数不变，故B错误；断开S,时电压表V与电流表A,的示数之比为电阻R的阻值，所以比值不变，故A错误：断开S,前，灯泡与电阻R并联，如果R短路，灯泡也短路，不能正常发光，故G错误；由于并联电路中，干路电流等于各支路电流之和，所以断开S时电路变成了只有电阻R的电路，而电阻R中电流不变，即电流表A的示数变小，故D正确。

【答案】We sat down next to each other..but David wouldn't look at me.I said gently and quietly,"No one can change your mind,except yourself.If you desire to challenge yourself,there isnothing to do with others'thoughts."He sat still with a deep breath."You have a full preparationbefore this event,which is the most important reason why you show up here",I added with asincere tone.Hearing my words,David turned to me tremblingly with tears spilling out of his eyesand expressed he had made a firm determination to finish the cross-country run.His coach heardwhat David saidand gave me a look-the kind that was more determined than anyone else's.I watched as David moved up to the starting line with the other runners.The race started.Itseemed that the runway was extremely long for young children,not to mention a child with a heartdisease.David insisted on running as if he had forgotten all his weaknesses,though he was trippedover within the a few kilometers.It didn't take long before he picked himself up again andcontinued his mission.Classmates all appeared on the racing track,cheering for him."Come on!You can make it!We are proud of you!"they shouted enthusiastically.To everyone's joy,hereached the final line and ranked the 20th.It was no more important whether he won the first placeor not.It was his brave heart and strong faith that could make something unusual happen finally.