如图为某地质考察队的科研人员在A、B、C三个不同的地层内挖掘出许多化石．在A层中有恐龙蛋、始祖鸟、龟等化石；在B层中发现了始祖鸟、马、剑齿虎、犀牛（这四种均属于哺乳动物）等化石；在C层发掘出了三叶虫、乌贼、珊瑚等化石．据此回答：

在食物链“小麦→蚜虫→瓢虫→食虫鸟”中，属于生产者的是（    ）

    Mr. Smith is my new friend. He1from Paris, France. He is a French2of a middle school. His students all like3very much. He can speak some Chinese,4not much. He wants to learn more, so he goes to5 classes every week. He likes living and working6China very much. He7 the Chinese people are very friendly(友好的). He has two8, Maria and Tom. They are students, but they go to different(不同的)9. They have some pen pals and they often write10 the pen pals. They also have many Chinese friends at school and they play games after class.