4. A　细节推理题。 根据第三段第四句中的the coins changed hands at once可理解为“钱马上就会易主”，即到了大孩子们的口袋里。

　　5. A　细节理解题。 根据题干中的complaints可定位到最后一段开头两句。该段第二句表明校长对大孩子的惩罚很轻微，因此本题应选A。

　　.1. Sister­city Relationship　2. international cities/different countries' communities　3. Purposes/Aims/Goals/Targets　4. share cultures　5. an idea　6. Areas/Fields　7. AIDS and HIV　8. 134　9. Cyber sister cities　10. the Internet

　　.One possible version:

　　Good morning, everyone!

　　Today I'd like to say something about outdoor activities.

　　Busy with hard work, we students spend no time doing outdoors activities, which has bad effects on our health. I think it is time for us to object to the trend and get close to nature.

　　When we are outdoors and in the natural world, we can not only breathe fresh air and admire beautiful landscapes, but also broaden our horizons and develop new skills, which in turn helps our study a lot.

　　There are many different ways we get out into the natural world, such as backpacking, cycling, camping and mountaineering. Playing sports outdoors with your schoolmates is also a good way of enjoying the open air while being part of a team.

　　Whatever you do, though, remember to stay safe. When you are outside, it is better to be accompanied by your parents or friends.

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