根据短文内容的理解，选择正确答案。   

    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.

已建立化学平衡的某可逆反应，当条件改变使化学平衡向正反应方向移动，下列叙述正确的是（   ）
①生成物的质量分数一定增加；                           ②生成物的物质的量一定增加；
③反应物的转化率一定增大；                              ④平衡时反应物的浓度一定降低；
⑤正反应速率一定大于逆反应速率；                    ⑥一定使用了催化剂；

如图所示，小孔前有一物体AB，请画出AB经过小孔成像的光路图，并在光屏MN上标出AB所成的像．

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《中国公民国内旅游文明行为公约》第二条规定：遵守公共秩序——不喧哗吵闹，排队遵守秩序，不并行挡道，不在公众场所高声交谈。之所以要求公民维护公共秩序，是因为（    ）

下面诗句描写的月相是（    ）

暮江吟（白居易）

一道残阳铺水中，半江瑟瑟半江红。

可怜九月初三夜，露似珍珠月似弓。