Man has a big brain. He can think, learn and speak. Scientists used to think that man are different from animals because they can think and learn. They know now that animals--dogs, rats and 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 hungry. or unhappy. Apes are our nearest cousins. They can understand some things mole quickly than human beings, and one or two have learned a few words. But they are still different from us. They cannot join words and make sentences. They cannot think like us because they have no language. They can never think about the past or the future. Language is a wonderful thing. Man has been able to develop civilization because he has language. Every child can. speak his own language vet well when he is four or five--but no animal learns to speak. How do children learn Scientists do not really know. What happens when we speak Scientists do not know. They only know that man can speak because he has a big brain.

The passage is mainly about （）

A．why animal can learn

B．why man has a big brain

C．why animal cannot speak

D．why man is different from animals

2011年2月25日，十一届全国人大常委会第十九次会议经表决，通过了刑法修正案（八）。此次刑法修改的重点之一是取消了近年来较少适用或基本未适用的13个经济性非暴力犯罪的死刑。此修正案还将醉酒驾车、飙车、拒不支付劳动报酬等严重危害群众利益行为定为犯罪。试分析对刑法进行修正的认识论依据。（10分）