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短文改错Yesterday morning,I participated on a school activity who theme focused on "Green Travel Starts FrominwhoseMe".About 100 students and teachers gather at the school gate at 8:00 and we set out ten minute later togatheredminutescycle around the city.It took us over two hours A finish the 20-kilometer ride.Tiring as we were,we felt proudtoTiredofusourselvesIt was the first time that I had been covered such a long distance by bike.I believe an activity is of greatthevalue as it reminds us that everyone can make a difference to the protect of Earth by traveling in a green way.protection

3.A由题意得，0<1<3 <π<4→f(-1)=f(1)> f()>f(π)=f(-),故选A.