A
An eBook library，sometimes called an eLibrary，is a collection of electronic books.Similar to a library filled with physical books，an eBook library can exist as a person's own collection of electronic texts or as a public library that allows users to keep electronic versions of books for a period of time.__1__ Meanwhile，they can be viewed as digital downloads on a computer.
Electronic readers can store ebooks and serve as an eBook library.These books，though they do not exist in a physical sense，are the property(财产) of the person who has purchased them.The digital format has also allowed private book collectors to leave their eBook libraries on the Internet.__2__
Some books “live” for a long time.Other classics are preserved for a few hundred years under glass and climatecontrolled conditions.But most paper books only last 10－20 years due to moisture(湿气)，mold，mice，silverfish, fire，etc.__3__ Who knows what the future may hold?
__4__ Many libraries now have an eBook library in addition to the physical books they have.People with library cards can borrow digital books from their public libraries by downloading them onto many different eReaders or their personal computers.
However，there are some disadvantages of ebooks.For example，some texts and other resources are simply not available in an electronic format.__5__ A person wishing to look at these resources must visit a traditional library.
A．Ebooks can be read on a number of electronic readers.
B．No trees are consumed in the process of creating ebooks.
C．In this way they can redownload their books whenever they want.
D．Ebooks，however，could potentially last thousands of years as digital files.
E．There is just nothing that will compare to the magic of a room full of books.
F．The popularity of digital books has affected the public library system greatly.
G．This is often the case with limitededition print journals or texts from centuries ago.
[语篇解读] 本文是一篇说明文。文章介绍了电子图书馆以及电子书的利弊。
1．解析：根据空后内容“Meanwhile，they can be viewed as digital downloads on a computer.”可知，本空与空后一句为并列关系，共同说明了电子书既可以在电子阅读器上阅读，也可以被下载到电脑上阅读。
答案：A
2．解析：本空与上句内容为递进关系，说明这样他们可以在任何时间重新下载他们的书籍，C项中的they指的是上句中的private book collectors。
答案：C
3．解析：本句与空前内容存在对比关系，说明与纸质书不同的是，电子书以数码形式存在很可能可以保存数千年。
答案：D
4．解析：根据空后内容可知，本句为本段的中心句。本段主要讲电子书的流行影响了公共图书馆系统，故正确答案为F项。
答案：F
5．解析：本空起承上启下的作用，说明有些限量版的杂志或几个世纪之前的文本不是以电子形式存在的，例证了上句内容，因此，想要看这些内容必须去传统的图书馆。
答案：G
