知代词it指前文提到的the book。B项"一次冒险"，C项"一处公共场所"，D项"身份编号"，均不是it所指的内容。]

　　3．What will a BookCrosser do with a book after reading it?

　　A．Meet other readers to discuss it.

　　B．Keep it safe in his bookcase.

　　C．Pass it on to another reader.

　　D．Mail it back to its owner.

　　C　[推理判断题。从题干中的after reading it判断答案在第四段。该段说，人们在看完一本书之后就把书留在公园的长凳、公共汽车、火车站及咖啡馆等地方，下一位找到这本书的人就到网站上记录他们找到这本书的地点，由此可推断选C项"把书继续传递给另一位读者"。A项"与其他读者会面，讨论这本书"，B项"把书妥善保存在书架上"，D项"把书邮寄给他的主人"，均不是会员的做法。]

　　4．What is the best title for the text?

　　A．Online Reading：A Virtual Tour

　　B．Electronic Books：A New Trend

　　C．A Book Group Brings Tradition Back

　　D．A Website Links People through Books

　　D　[标题归纳题。本文主要介绍了BookCrossing这个网站，因此这篇文章的标题应体现出"网站"这一关键点，再根据第三段中的the people you meet and books you read可知只有D项涵盖了这些信息。]

第三节 .完形填空

Having a great collection of books at home doesn't mean that you are a person of culture. It can be just to 1 people around you.There are also many people who cannot 2 so many books because of high prices，so they usually go to a 3 and spend hours reading something that 4 them a lot.