阅读理解：七选五AHave 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 maydiscover 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。
BShould We Get Rid of Cash?When it comes to money, many people still think of the paper bill in their wallets. For years, cash (or paper currency) has played an important role in our daily activity.__1__The idea first came up when he read a statistic report about currency distribution released by the US Treasury, the department in control of the central bank. __2__ On the other hand, border states like Florida and California, which were heavily involved in drug trafficking (贩毒), see an ever increasing need for large bills.Rogoff argues that most big bills in circulation were being used for one of two purposes. Profitmotivated crimes s uch as illegal gambling, drugs, prostitution, loan sharking, the fencing of stolen merchandise take up a major part. Tax evasion (逃税) by people who arrange to receive cash income and don't report it also contribute to its popularity.__3__However, the total amount of cash issued by government is still booming. The government don't know where it goes. __4__ But they are happy to know that it's popular, because they make money by making money — about $70 billion a year. It is unlikely that they can enjoy such benefit though. If taken into account the human cost, the enforcement cost, the tax loss, these visible profits will be easily offset.__5__ Here's a typical opinion: “The day we go cashless, the government will be able to track your every move. This is n othing more than a call for dictatorship.”A．He strongly urged the government to do something about it.B．They don't know who's using it.C．There are other people who see cash very differently.D．The problem is that it also aids crime.E．But Harvard professor Ken Rogoff is now appealing to the government to put it into extinction.F．He noticed that some regions, like the Midwest, had almost no demand for the $100 bills.G．But its popularity is slowly decreasing as we have more ways to pay, according to Harvard professor Ken Rogoff.语篇解读：本文是一篇议论文。
文章以“金钱”为切入点，主要讨论了是否应该取消现金的问题。
1．选E 空格前提到现金在我们的日常活动中起重要作用，再结合第二段第一句中的“The idea first came up when he read a statistic report”可以判断，空格处应指但是有人认为应该取消现金。
E项承上启下，符合语境。
故E项正确。
2．选F 空格前提到Rogoff读过一份货币流通的统计报告；空格后提到另一方面，一些涉及大量贩毒的边境地区需要大面额纸币，故空格处应介绍Rogoff从报告中获取的关于不需要大面额现金的信息。
F项“他注意到一些地区，像中东，几乎不需要100美元面额的钞票”，符合语境。