“落花不是无情物，化作春泥更护花”，自然界的物质循环是须臾不止的．图示自然界中的物质循环，请据图作答：

       My friend Tony is an American   1  . He is ten years old. He lives  2  his family in China now. There are   3   people in his family; his mother Mrs. Green, his father Mr. Green and his little sister Amy. He has a white cat.  4  name is Betty. Look！Amy is playing   5  Betty. His father, Mr. Green, is watc­hing TV. His mother is doing housework. What about Tony? He is doing   6 Chinese homework. He can't  7 Chinese well, but he likes Chinese very much. Tony's 8 works in a TV station. His father works in a school as an   9  teacher. Tony and his sister 10  to the same school.

一个不透明的袋子中有3个红球和2个黄球，这些球除颜色外完全相同．从袋子中随机摸出1个球，这个球是黄球的概率为 ____．

下列自然条件适合发展种植业的是（　　）