某实验小组按照课本要求探究并联电路中电流的关系，他们设计的电路如图所示。把电流表分别接入到电路中的A、B、C处，测出它们的电流，填入下表：

①根据电路图，完成连线____；

②通过对上面数据的分析,可以得出结论是:____；

③测量三次的目的是：____，在实验中我们可以采用____的方法改变电流的大小从而进行三次实验；

晚春

韩愈

草树知春不久归，百般红紫斗芳菲。

杨花榆荚无才思，惟解漫天作雪飞。

由Mg(OH)₂和MgO组成的混合物，测得其中含镁元素的质量分数为48％。该混合物10g，将其投入适量的稀硫酸中恰好完全反应，所得溶液中溶质的质量为（）

说说下列细节描写有什么作用。

①花匠阿标叔也巴结地把煤气灯玻璃罩擦得亮晶晶的。

②（我）就在每个人怀里靠一下，用筷子点一下酒，舔一舔。

③早已偷偷把手指头伸在杯子里好几回，已经不知舔过多少个指甲缝的八宝酒了。

    One of the easiest ways to keep healthy is to do jogging. Jogging is the name for a very gentle(舒缓的) running—it is just a little faster than walking.

    Start slow jog 20 meters, then walk 20 meters. Little by little, if you are not feeling very tired, you may do more jogging and less walking. Finally, jog the whole way. It will be easy for you to start jogging for 15 minutes twice a week, slowly, increase(增加) this to 20~30minutes every day. The longer you join in jogging, the more you enjoy it and the healthier you will become. Some people like jogging alone, and others enjoy doing it with friends. Jogging in groups makes more people keener(热心的), because you just can not stay in bed while there is a group of friends waiting outside.

    If you want to start jogging, prepare(准备) a pair of comfortable shoes and determined mind.