绿色植物光合作用的意义是（    ）

①为其他生物提供氧气来源   ②促进水分和无机盐的运输    ③降低叶片温度   ④为其他生物提供食物来源   ⑤满足自身生长、发育、繁殖的需要

     Mrs Smith is Jim's mother. She loves her family very much. She often buys food, fruit and clothes for Jim and his father. Now many clothes are on sale at a good price.
     Mrs Smith comes to the store and she wants to buy some clothes. They have sweaters in all colors for￥15 each and sports shores for only ￥28.Mrs Smith likes the red sweater and  she buys one for herself(她自己).She buys a pair of sports shores for her son. The T-shirts in the store are just ￥18! She buys a white one for Mr Smith. And that's not all. The socks, in all colors, are ￥2 each. She buys five pairs.