Now more and more people in the world are getting fatter. This troubles them a lot. （1）Experts(专家) say that it has a lot to do with our eating habits.
    Our eating habits are very important for good health and a strong body. Most of us like eating sweets and ice cream better than vegetables and rice. Sweets and ice cream are not bad for us if we eat them at the end of a meal. （2）If we eat them before a meal, they may take away our appetite(食欲).
    It's important for us to eat our meal in the same period each day. When we feel worried or excited, we may not want to eat. A long time ago, in England, some judges(法官) often decided whether a man was telling the truth by giving him some dry bread. If the man could not swallow(吞) the bread, it meant that he wasn't telling the truth. Because when a man is worried about something, he will have trouble in swallowing anything dry, because he loses his appetite.

用氯化钠配制100g溶质质量分数为20%的氯化钠溶液，现有下列操作：①溶解；②称取氯化钠；③过滤；④量取水；⑤计算；⑥蒸发结晶．正确的操作顺序是（　　）

①发挥收入分配的激励作用，调动人民的积极性和创造性

②改变收入差距过大的现象，逐步走向共同富裕

③人民平均分享改革开放的成果

④社会的公平正义与和谐稳定

古诗“少小离家老大回，乡音无改鬓毛衰”中的“乡音无改”主要是指没有改变（　　）

    先生讲得很详细，大家听得很认真。

    后来，有个同学问孙中山：“你向先生提出问题，不怕挨打吗？”

    孙中山笑了笑，说：“学问学问，不懂就要问。为了弄清楚道理，就是挨打也值得。”