题目

61.    In this c                  society(竞争激烈的社会), you have to study constantly to improve yourself. 62.    My sister always                      every chance ( 抓住一切机会) to practice her spoken English, which has been greatly improved. 63.    Her award will not mark the end of her campaign for                               (拥护) girls’ education. On the contrary, this is really the beginning. 64.    Social                   (社会风俗习惯) vary greatly fr2．在探究并联电路中电阻的规律时，小明同学分别按图（a）、（b）所示电路图连接电路，图（b）中电阻R是他用来替代图（a）中并联电阻R1和R2的电阻，则选择的电阻R应满足的条件是：在保持电压不变时，电流表A3的示数与电流表A1（填“A1”或“A2”）的示数相同，这里所用的科学方法是等效替代法．