现在网上购物很流行，假如你的朋友想在网上买一款MP4， 但她不知如何操作，请你根据表格中的提示写一篇短文， 向他介绍网上购物的益处，购买MP4的过程及网上购物的不利因素。
要求：1.文中谈论网上购物的益处和不利因素均不少于两点。
2.语言规范，80词左右。文章的题目和开头已经给出，不计入总数。

阅读理解

阅读下面短文，然后按要求做题．

　　The Youth Hostels Associations of England and Wales and Scotland have more than 400 hostels, many of them in lovely countryside. They're a very good idea for travelers of all ages and families too, not only are they cheap and friendly, they're also good places to visit. Everyone in a Youth Hostel helps with the housework and prepares their own meals, though some hostels offer cheap meals too. As Youth Hostels are popular, especially in summer and at I3ank Holidays, it's a good idea to book. The YHA also organizes special interest holidays for different outdoor sports, activities and interests.

　　To use the hostels you have to be a member. The cheapest way to do this is to join a YHA in your own country that is a member of IYHA. This makes finding a hostel and booking easy too, these association can offer you with the International Handbook, which has addresses and information about youth hostels in many countries, and with advance booking vouchers forms you can use to book a place in youth hostels in other countries.

　　If you can't join in your own country, you can ask for an International Guest Card, either before you come or when you're in Britain. Write to or visit YHA Services for International Guest Cards, maps and handbooks, they can also offer information about booking hostels, travel and special interest holidays.

　　注释：association n．联合；联盟　　advance adj．提前的　　voucher n．证件；证明

根据短文内容回答下列问题．

1．Where are most of Youth Hostels?

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2．Why are youth hostels cheaper?

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3．Who can use youth hostels?

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4．What is IYHA short for?

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5．Where can we find addresses and information about youth hostels?

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