3．A：Hello，Bob． B：Hello，Jerry．（81）Have you been to City Zoo？ A：Yes，I have．The animals in City Zoo are very interesting． B：Really？By the way，（82）Do you like the zoo？ A：Yes，I do．It's a safe and clean place for animals． B：I see．（83）How often do they feed the animals？ A：Twice a day． B：Twice a day？Why？ A：Because they don't have enough money to buy food for the animals． A：What a pity!What can we do to help them？ B：（84）We can make money by collecting the waste paper． A：And then we can sell the waste paper．It's a good way to make money．And it can also help to protect the environment．As we all know，（85）paper is made from wood． B：Right．This way，we can save both paper and trees．
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