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.

①硅是构成一些岩石和矿物的基本元素

②水泥、玻璃、水晶饰物都是硅酸盐制品

③高纯度的硅单质是良好的半导体材料

④陶瓷是人类应用很早的硅酸盐材料

⑤水玻璃可用于生产黏合剂和防火剂

⑥二氧化硅是一种原子晶体，用作光纤以及电脑芯片．