The scientist was in a hurry. She had to get some for her experiment before darkness fell. She was testing the water in the rivers that went into the ocean. Her job was to find out the cause of pollution the sea at nearby beaches. She lifted out the water and looked angrily at the rubbish in it. Old clothes，plastic bags and pieces of paper were in the water. "Don't people that everything they throw onto the street gets washed into rivers? And they lead right into the ocean!" she said loudly. "How many years will it take to make it clean again?"
The scientist felt sad deep in her heart. She about the ocean animals as she walked back to the beach. But when she got there，a group of students and teachers from local primary school were carrying bags of rubbish to the bins. They had spent their afternoon cleaning the beach! She was with joy.
she spoke with the teacher，the students gathered around them. With smiles on their faces, they shouted, "We do something to protect the ocean!"
"That's right," agreed the scientist，as she smiled at their kindness.
