Cr（H₂O）₄Cl₂Cl•2H₂O中Cr的配位数为　 ____；已知CrO₅中Cr为+6价，则CrO₅的结构式为 ____

如图，宽为50cm的长方形图案由10个相同的小长方形拼成，其中一个小长方形的面积为____cm²．

植物光合作用过程中，物质和能量的变化是（  ）

任务型阅读 
    My friend, Tom lives a happy life.（1）He usually gets up at 6:00 . Then he goes for a walk. At 7:00 he comes back. He brushes his teeth and takes a shower. （2） Then he eats breakfast. After breakfast, he goes shopping（购物）with his friends. （3）他大约十点半到家。And he cooks lunch. After lunch, he goes to the club. He reads books and plays chess. He eats dinner at home at 6:00 pm. （4）           the evening he likes watching TV. At around 9:00 pm he goes to bed.
根据短文内容，完成下列任务

以下对自然资源利用的过程中只发生物理变化的是（   ）