生物体内蛋白质千差万别，其原因不可能是（   ）

风速计是由风叶和改装的电流表构成的．风速越大，风叶转动越快，电流表读数也越大．下图中与之相同的是（　　）

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    My father is 40. He is a good driver1a good father.
    My father likes2sports very much. Every morning, he3and runs in the People's Park. He also plays basketball. He is so strong and healthy. He always says to me, “Sports can make us strong.” My father loves4and his favorite book is Car Fanatics. He likes cars5.He wants to have an6car. It is his dream. I  hope I can buy one7him in the future.
    I am8only daughter, and my father loves me very much. He buys me anything I want. When I make mistakes( 犯错误), he never hits（打） me. He says to me9a smile, “ 10do that again,” We love each other very much. I hope my father can keep healthy forever.

从我国土地利用构成中可知，比重最大的是（   ）