17．Li Ruyan，13years old，did something special last summer with his classmates in Shanghai．They worked in groups with traffic police at different crossroads in the city．Holding small red flags，the students helped keep order and stopped people from jaywalking （乱穿马路）．As part of the school project，Li's school has encouraged its students to do more community （社区） work．After the half day of exhausting work，Li told himself not to jaywalk anymore．
"I think through community work we get to help others and，more importantly，we grow a sense of responsibility （责任感），"he said．
Community service is an important part of education for teenagers around the world．In the US and Canada，high school students need to finish 40hours of community service before graduation．In America，those who have finished 1，400hours of community work can be awarded nearly $5，000 （33，000yuan）．
Chinese students today do more community work，too．For example，starting from 2010，Sichuan high school students have been asked to do 10days of community work．It will become part of their school grades．
Qian Lijun，16，and her classmates in Suzhou，Jiangsu went to a local elder care home this winter．They put Spring Festival couplets （对联） on the walls and cheered up the people living there．
Li Xiaotian，15，in Anshan said he used to clear flyers （小广告） from telephone poles （电线杆） with his classmates．They brought tools，towels and buckets and worked for three hours under the summer sun．"It was tiring，but seeing the clean poles without ugly ads，we really felt proud，"he said．
根据短文内容，选择正确答案．
51．What was the special thing Li Ruyan did last summer？C
A．He joined a special group of class13．
B．He became a policeman．
C．He helped the traffic police at a crossroad．
D．He stopped people from talking．
52．From this passage we know thatD．
A．Li Ruyan's school is in the middle of a big city
B．Li Ruyan and his classmates do some community work every day
C．Ruyan and his classmates often hold small flags when they cross the roads
D．Ruyan and his classmates think it is good for them to do some community work
53．Community serviceB．
A．has become a very important part of education only in China
B．is very important in school education in some foreign countries
C．is the only part of the school project for teenagers around the world
D．needs students to finish at least 1，000hours of community work
54．Which of the following is not true according to the passage？D
A．The students in Shanghai helped people to keep the traffic rules．
B．The students in Suzhou visited the old people's home．
C．The students in Anshan cleaned the walls under the summer sun．
D．The students in Sichuan sent spring festival couplets to the old people．
55．Which of the following is not true according to the passage？D
A．Community service helps students grow a sense of responsibility．
B．Through community work students get to help others and learn something．
C．Students are now encouraged to do more community work in many schools in China．
D．Students will be awarded much money for doing more community work in Canada and the US．
