①杜诗发明水排，用水力鼓风冶铁

②灌钢法

③青铜器的铸造

根据短文理解，选择正确答案。

    I have two pets. They are Fly, a dog, and Huahua, a cat.

    Fly is brown and grey. He is naughty(淘气的). He sometimes steals(偷) food in the kitchen.  Once, when there was nobody at home, Fly pulled (拉) a piece of meat off the table. But he was not careful enough. The plate also fell to the floor. When I got home, I saw the broken plate all over the floor, so I became very angry. Fly was so afraid that he went back to his bed at once.

    Huahua is a white and yellow cat. She is not beautiful but she is very lovely. Every night at weekends, Huahua sleeps on my bed. When she sleeps, she always snores. It is very funny.

    Huahua is also naughty. Whenever she does something bad and my grandma tries to catch her, she runs away quickly and hides quietly under the bed.

    Fly and Huahua love to play games with me and I like them very much.

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