如图1是我国古代著名的“赵爽弦图”的示意图，它是由四个全等的直角三角形围成的．若 $AC=6$ ， $BC=5$ ，将四个直角三角形中边长为6的直角边分别向外延长一倍，得到图2所示的“数学风车”，则这个风车的外围周长是____．

阅读材料，完成任务。

    My uncle Jack is an interesting man. When he speaks, his mustache（胡子） always dances. It is so funny. He wears glasses and a funny hat.

    I don't like my boss（老板） at all. He is heavy with two small eyes. I think his glasses are too small for him.

— Look, the salesman（商人） is coming.

— Which one?

— The one with short black hair. He always takes his umbrella(雨伞) and suitcase(旅行箱). And his tie is very ugly.

— What are you doing, Lucy? Look at your pants. They are so dirty!

— I am doing some cleaning. Don't come here, Jane. Your beautiful skirt will be dirty.

如果将细胞比做汽车，那么细胞中的____相当于发动机，它将细胞中的一些____当做燃料，使之与____结合，经过复杂的变化转变成____和____，同时将有机物中的____释放出来供细胞利用．

读下图, 图中地中海沿岸地区农业生产由原来的以混合型农业为主到现在的以园艺业为主,其原因主要是（    ）