2. 自考
  3. Human beings act in a different way from【C1】______of animals just because they can speak while animals cannot. Even the cleveres

Human beings act in a different way from【C1】______of animals just because they can speak while animals cannot. Even the cleveres

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问题     Human beings act in a different way from【C1】______of animals just because they can speak while animals cannot. Even the cleverest animals cannot do things which to us seem very【C2】______and which small children, as soon as they learn to talk, would be able to do.
    A German scientist, who【C3】______experiments for many years with big apes, found that his apes could use his sticks as tools to pull down bananas which they could not【C4】______. But they only used the stick to get a banana when both the banana and the stick were in view at the same time. If the banana was in front of them and the stick was behind them, they could not use the stick. They could not keep the banana【C5】______enough in mind to look around and then pick up the stick and use it.
    The【C6】______for this is clear. We have words for banana and stick which help use to think about these things when they are not in【C7】______Even a small child knowing the words "banana" and "stick" has an idea of their relationship and is able to think "stick" together with "banana" and to remember this long enough to pick the stick【C8】______behind and use it on the banana.
    【C9】______to speak, animals cannot keep their knowledge of things for long. That is why they often interrupt one line of action to do something else and later forget it completely. Human beings, on the other hand, use【C10】______and are able to do one thing continuously.
【C3】
选项 A、carried
B、dealt
C、developed
D、performed
答案D
解析
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