题目

【1】 Perhaps he began by making sounds like those made by animals. Perhaps he grunted(发出哼声) like a pig when he lifted something heavy. Perhaps he made sounds like those he heard all around him—water splashing, bees humming, a stone falling to the ground. Somehow he learned to make words. As the centuries went by, he made more and more new words. 【2】 People living in different countries made different kinds of words. Today there are about fifteen hundred different languages in the world. 【3】 A very large English dictionary, for example, contains four or five hundred thousan下图表示基因型为AaBb的某哺乳动物产生生殖细胞的过程，下面说法错误的是(　　) A．Ⅰ过程表示细胞进行有丝分裂 B．细胞中染色体数目减少一半是通过Ⅱ过程实现 C．一个A细胞经过减数分裂形成的C细胞有4种基因型 D．该哺乳动物为雄性个体