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

All social animals communicate with each other, from bees and ants to whales and apes, but only humans have developed a 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 a
language which is more than a set of prearranged signals. Our
speech even differs in a physical way of the communication of other【S1】______
animals. It comes from a cortical speech centre which does not
respond instinctively, and organises sound and meaning on a【S2】______
rational basis. This section of the brain is unique to humans. When
and how the special talent of language developed are impossible to【S3】______
say. But it is generally assumed that its evolution must have been a
long process. Our ancestors were probably saying a million years【S4】______
ago, but with a slower delivery, a smaller vocabulary and above all
a simple grammar than we are accustomed to.【S5】______
    The origins of human language will perhaps remain forever
obscurely. By contrast the origin of individual languages has been【S6】______
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
relatively a few families—probably less than twenty. Languages are【S7】______
linked to each other by sharing words or sounds or grammatical【S8】______
constructions. The theory is that the members of each linguistic
group have descended one language, a common ancestor. In many【S9】______
cases that original language is judged by the experts to have been
spoken in surprisingly recent time—as little as a few thousand years【S10】______
ago.
【S9】
选项
答案descended∧一from
解析 介词缺失。该句意为“有一种理论认为每一种语系中的不同语言均起源于同一种语言。”descend from为固定搭配，意为“起源于”，故在descended后加上介词from。
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