解析　为挣钱而工作当然是辛苦的。

　　答案　D

　　19．A.since

　　B．if

　　C．than

　　D．though

　　解析　该句话的意思是：James知道他的自行车意义重大，因为他是用自己的钱购买的。

　　答案　A

　　20．A.deserved

　　B．benefited

　　C．achieved

　　D．learned

　　解析　他通过自己的努力实现了自己的梦想。achieve实现，符合句意。

　　答案　C

　　Public bookshelves are appearing across Germany on street corners，city squares and in suburban supermarkets.In these free­for­all libraries，people can grab whatever they want to read，and leave behind anything they want for others.There’s no need to register，no due date，and you can take or give as many as you want.“This project is aimed at everyone who likes to read.It is open for everybody，”

　　Michael

　　Aubermann，one of the organizers of the free book exchange said.

　　The western city’s latest public shelf was put up next to Bayenturm.It is the fourth free shelf that Aubermann’s group，the Cologne Citizen’s Foundation，has placed outside.“We set up our other outdoor shelves last year and it’s been working really well，”

　　said Aubermann.The public bookshelves，which are usually financed by donations and cared for by local volunteer groups，have appeared independently of each other in many cities，suburbs and villages.Each shelf holds around 200 books and it takes about six weeks for a complete turnover，with all the old titles replaced by new ones.

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