第1个回答 2012-12-08
A group of students went to park for a picnic. when they played there, they threw rubbish away here and there without realization of environment. however, on their way home, a girl pretended to looked for things she lost in the park and called for everybody back to park again. they realised that they made a mistake for throwing rubbish casually. Finally, they collected them together and put them in proper position.
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