下列各项中，属于食物链的是（　　）

At that time，everyone____ the street.

    Today was Emily's birthday. She was happy and went home quickly after school.

    “You have to look for your gift on your own，” her sister said. “Here is the first clue(线索).” She gave Emily a piece of paper.

    Emily opened the note and read， “Clue Number 1： Look inside the car.” She found a bone(骨头) for dogs and another note in the car.

    “Clue Number 2： Look at the swing.” On the swing there was a bag of dog food with the third note.

    Again she quickly read the note， “Clue Number 3： Look into the house.” Emily found a dog's leash(皮带) there.

    The note on the leash asked her to go outside. There she saw a beautiful red doghouse.

    Before she got there， a black puppy ran up to her. It had a note on it. The note said， “Happy Birthday， Emily.”

    “Oh， such a cute dog!” she cried. She was so happy. “I will name her Happy， because she made me so happy today，” Emily said.

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结合材料，从文化传承与创新角度，说明我们应如何创作生产优秀文化产品。