《中国古代文化常识》的作者马汉麟在该书中写道：“姓名、礼俗、宗法——这是‘社会’一系的内容。明星固然耀眼，反映时代真实面貌的却是广大民众。”据此可知作者强调研究(    )

下面的话，有不同的理解，请写出两种意思来。
①打败了敌人的士兵。
甲种理解：
乙种理解：
②爱护人民的军队。
甲种理解：
乙种理解：
③他已经不在了。
甲种理解：
乙种理解：
④中国队踢败美国队赢了。
甲种理解：
乙种理解：
⑤中学校里的大学生。
甲种理解：
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⑥城市中小学教师。
甲种理解：
乙种理解：

   Stress is everywhere in our everyday life. Not only men have it, but also women and young people.
   The most important reasons of stress are: death, diseases, exams, making money, getting married, moving houses, changing jobs, ending friendships and so on.
   How do you know whether you have stress or not? Could you give your answers to the following questions?

   If your answer "Yes" to more than two of these questions, you are one of those people with stress. So what can you do about it?
   Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving (减轻) stress. However, doctors now say that there are easier ways-people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should   X  more often, because crying is a natural way of relieving stress.

①在气体扩散实验中，抽去玻璃板后，红棕色的NO₂气体进入到空气中

②在液体扩散实验中，红墨水滴入热水，热水很快变红

③扩散现象表明，一切物质的分子都在不停地做无规则运动

④温度越高，分子的无规则运动越剧烈．