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last Sunday, i went sightseeing with my friends in the Lake Park. The park was full of freshness and beauty of spring,with the sun shinning and birds singing.When i was enjoying the fantastic scenery around ,something unpleasant caught my eye.A young man couple in a boat were eating,talking,laughing loudly as if they were the only people in the world.What' s worse, they spat and even threw rubbish into the lake,totally ignoring the noticeable sign"No Littering'' nearby.What a shame.