在生态系统中，从总体上看各组成成分储存的能量，排序正确的是（ ）
A．植物的数量＞草食动物＞肉食动物
B．草食动物＞肉食动物＞植物的数量
C．肉食动物＞草食动物＞植物的数量
D．肉食动物＞植物的数量＞草食动物
生态系统的营养结构由食物链和食物网构成．生产者与消费者及消费者之间形成了食物关系，生态系统中，不同生物之间由于吃与被吃的关系而形成的链状结构叫做食物链．多条食物链彼此交错连接形成食物网．生物种类越丰富，个体数量越大，食物网越复杂，而且食物网中，植物的数量大于植食性动物的数量大于肉食性动物数量．生态系统的两个基本过程：能量流动和物质循环，就是沿着这种渠道进行，且逐级递减．因此，选项B、C、D是错误的．
故选：A．
| 阅读理解。根据短文内容，完成下列各句。 Mrs. Green is going to give a birthday party for Kate. Kate is her daughter. Kate will be fourteen years old. A lot of Kate's friends will come to the party. Mrs. Green will go shopping. She will buy some fruit and a big cake for the party. It's three o'clock now. Everything is ready. Kate is wearing her new dress. It's a white dress. Now the doorbell is ringing. Kate's friends are outside the door. The party is going to start at three twenty. 1. Kate is Mrs. Green's _____. 2. Kate is _____ years old now. 3. Kate's _____ will go shopping. 4. Kate is wearing a new _____. 5. The party is going to start at three _____. |