（8+4）×25=8×25+4×25，运用了乘法分配律。[ ]

智慧眼（看图选择正确的对话）

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1. A: Is that your toy train?            

    B: Yes, it's my new toy train

2. A: What's that in English?         

    B: It's a pencil sharpener.

3. A: What's this on the chair?        

    B: It's a book.

4. A: Who's that man?                

    B: He's my uncle, Mr Black.

5. A: Is he your brother?              

    B: Yes, he is.