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Unit
                                                                                                                4



                                               I was happy, but now I’m sad.












                                                                             Reduction in quantity

                                                                             2010

                                                                             2021         2010             2021


                                                                             2001


                                         2021                                2021         2001             2021


                                                                                            *  quantity 數量
                                  618 polar bears












                                        2021



                                                                    It’s hot and dry in summer.
                                92,000 koalas
















               What?


                    What can you do to help the animals?
                                                                                                       sixty-five  65
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