A
Have you wanted to try an ebook? Has the cost of ebooks stopped you? Well, there are ebooks that you can download.__1__ Others share information about where to find free or discounted ebooks.
There are several reasons some ebooks are free.In some cases, the book's copyright (版权) has come to an end.In other cases, writers offer books for free to grow a readership.__2__ The writer hopes you will like the first book enough to buy those that follow.Similarly, Amazon is filled with free ebooks, with a list of the top 100 free ebooks.This list changes constantly, based on how well the books are “selling” and whether they become or remain free.
When you find a free ebook you want to read, get it right away.__3__ If you wait too long, you may discover the book now has a price attached.
__4__ They offer free ebook files to download directly from the sites.These files could have bad software designed to infect your computer.It is best not to download ebooks, or any file, from an unknown site.
Some free ebook sites offer referral (推荐) links to other websites. __5__ These referral sites help you find free ebooks of interest to you.They also let you know when an ebook is free or goes on sale.
A．Be careful of some websites.
B．So visit Amazon's list quickly.
C．Several websites offer free ebooks.
D．Referral links provide lists of best sellers.
E．Often the offer is open only for a short time.
F．Often a free ebook will be the first in a series.
G．Therefore, you can download free ebooks there.
语篇解读：本文是一篇说明文，介绍了获取免费电子图书的一些注意事项。
1．选C 根据上句的“you can download”和下文的“Others share information ...”可知，此处是指一些网站提供免费电子图书，而另外一些网站则提供关于免费或者打折电子图书的信息。
2．选F 第二段主要介绍了提供免费电子图书的一些原因。根据下句的“buy those that follow”可知，有些作者为了吸引读者，系列丛书的第一本往往是免费的，一旦你喜欢上了，你就会花钱购买系列中的其他图书。
3．选E 根据上句的“get it right away”和下句的“If you wait too long, you may discover the book now has a price attached.”可知，如果你找到了想读的免费电子图书，就及时下手，否则等的时间长了，你会发现书签上有了标价。故E项(通常免费提供期是很短暂的)最恰当。
4．选A 根据本段的“infect your computer.It is best not to download ebooks, or any file, from an unknown site”可知，该段主要告诫读者警惕一些不良网站。
5．选G 根据本空后的“These referral sites help you find free ebooks”可知，一些免费电子图书网站提供访问其他网站的链接，因此你可以在这些推荐网站下载免费电子图书。
