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Ali and his friends usually go out on holidays and enjoy walking and playing in the nature. They usually do different things when go on holidays. Which of the following things they do is bad for nature?

1 ) 

They water the plants and trees

2 ) 

They keep off the grass and beautiful flowers

3 ) 

They are careful not to hurt any animal

4 ) 

They throw the water bottles in the river

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امید جهانفر