7．him　指代前面的the boy。

　　8．to offer　would like/love to do sth.＝feel like doing sth.想干某事。

　　9．was working　表示“过去一段时间一直在干某事”要用过去进行时。

　　10．to　 explain(sth.)to sb.向某人解释某事情。

　　Ⅲ.阅读理解

　　A

　　Just how comfortable is your sofa? Would you be prepared to let a stranger crash(躺下睡觉) out there for the night? Just on the basis of a short e­mail correspondence(通信) and seeing a photo of the sofa，would you travel halfway across the world to do the same? It might sound crazy，but this is exactly what millions of people are doing—it's known as couch(沙发) surfing.

　　Couch surfing is travelling on a budget，using a broad network of contacts in order to get overnight accommodation for free，or at as little cost as possible.Participants join dedicated(专业的) websites，providing as much information about themselves as possible in order to make others feel comfortable hosting them，or using them as a host.

　　Various safety features are available in such online networks，like verification (确认) of names and addresses，personal references and vouching (担保) for a particular member as a reliable host or guest.

　　As well as the financial advantages of couch surfing，participants also claim that the practice gives them a more unique，authentic travel experience，allowing them to get to know culture and cuisine through the locals rather than through tour agents.“Couch surfing is not just about finding free accommodation.We open our minds and lives and welcome the knowledge that becomes available through cultural exchange，” said Casey Fenton，founder of CouchSurfing.com, “CouchSurfing wants to change not only the way we travel，but how we relate to the world.”

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