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Nowadays,it's common to keep dogs as pets.We can often see dogs' owners taking them for a walk. But have you (1)h______ of taking penguins for a walk?Here (2)i______ a piece of news from Japan.In Tokyo Zoo,penguins go out for a walk in line every day.It is said that this can make them happy and stop them from being homesick (想家的).The penguins in the zoo didn't eat as (3)w______ as they did in South Pole (南极) and they were (4)u______ to the keepers when they first got to the zoo,maybe they were not used to the life in the zoo.So the zoo keepers (5)c______ up with this good idea.They just let them walk as they did in South Pole.Now,all these penguins have become happy. |
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你能帮帮他们吗
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(a的平方+8a+16分之16-a)+(2a+8分之a-4)*(a+2分之a-2)
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