题目

Man has a big brain. He can think, learn and speak. Scientists once thought that men are different from animals because they can think and learn. They know that animals can learn—dogs, rats, birds can learn. So scientists are beginning to understand that men are different from animals because they can speak. Animals cannot speak. They make noises when they are afraid, or angry, or unhappy. Apes（猿） can understand some things more quickly than human, one or two have learnt a few words. But they are still different from us. They cannot join words and make sentences; they cannot th16、阿拉伯数字在我们的学习、工作和生活中运用相当广泛，它的发明者和传播者分别是     A．古代印度人、巴比伦人            B．古代阿拉伯人、罗马人     C．古代印度人、阿拉伯人            D．古代阿拉伯人、埃及人