17．
As mobile phones grow in popularity，telephone booths have become fewer in German cities．But a new project in Berlin is hoping to turn them into shelters for another endangered technology-books．
Konrad Kutt of the Institute for Sustainability in Education，Employment and Culture decided to start the BücherboXX project to improve reading in Berlin．They filled telephone booths that are about to be thrown away with books and put benches outside for people to sit down and take a reading break．"It teaches people about reusing in details，about sustainability （持续性） and also about improving learning，"said Kutt．These public bookshelves are in the streets of many cities across Germany．These libraries are supported by donations and taken care by local volunteer groups．Each shelf holds around 200 books．It takes about six weeks to replace the old books with new ones．
Each of Berlin's three current reading booths has been colourfully painted by students who are also responsible for building the benches and bookshelves inside the booths．The telephone booths themselves were bought from telephone companies that set to just throw them away．
Some community members keep an eye on the booths to prevent destroying and make sure they are often cleaned．In these libraries，people can read whatever they want to read．Local people who visit the booths are encouraged to leave one of their own books when they take a book with them．There are no sign-out sheets or rules for visitors to follow，like at a library because the BücherboXX system relies on trust and the community's good will．
One woman named Petra Rücker，a 45-year-old social worker，stopped by to take a look at the books．"I come by here on the way to work but never have stopped by until now，"Rücker said．"It looks interesting．"This time，she left without a book．"But I will certainly be back here，"she said．
64．Are telephone booths very popular in Germany？No．/No，they aren't．
65．How long does it take to replace the old books？（For） about six weeks．
66．Why are there no sign-out sheets or rules for visitors to follow？Because the BücherboXX system relies on trust and the community's good will．
67．Did Petra Rücker leave the booth with a book or without a book？Without a book．
68．What are the main points about the passage？What the project is and how it works．．
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