All social animals communicate with each other, from bees and ants to whales and apes, but only humans have developed the langua

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问题     All social animals communicate with each other, from bees and ants to
whales and apes, but only humans have developed the language which is more【M1】______
than a set of prearranged signals. Our speech even differs on a physical way【M2】______
from the communication of other animals. It comes from a speech center
which does not respond instinctively, but organizes sound and meaning on a
rational basis. This section of the brain is unique to humans. When and how
the special talent of language developed is impossible to say. So it is generally【M3】______
assumed that their evolution must have been a long process. Our ancestors【M4】______
were probably speaking a million of years ago, but with a slower delivery, a【M5】______
smaller vocabulary and of all a simpler grammar than we are accustomed to.【M6】______
The origins of human language will perhaps remain for ever obscure. With【M7】______
contrast the origin of individual languages has been the subject of very precise
study over the past two centuries. There are about 5,000 languages spoken in
the world today(a third of them in Africa), but scholars group them together
into relative few families—probably less than twenty. Languages are linked【M8】______
to each other in shared words or sounds or grammatical constructions. The【M9】______
theory is that the members of each linguistic group have descended from one
language, a common ancestor. In many cases that original language is judged
by the experts to have been spoken in surprisingly recent times—as little a few【M10】______
thousand years ago.
【M5】

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答案of一/

解析 介词冗余。a million years指“一百万年"。英语中数词a million与years之间不需要加入介词of。
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