Human beings act in a different way from【C1】______of animals just because they can speak while animals cannot.【C2】______the clev

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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.【C2】______the cleverest animals cannot do things which to us seem very【C3】______and which small children,【C4】______they learn to talk,would be able to do.
    A German scientist, who【C5】______experiments for many years with big apes, found that his apes could【C6】______his sticks as tools to pull down bananas which they could not【C7】______But they only used the stick to get a banana when both the banana and the stick were【C8】______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【C9】______the banana【C10】______enough in mind to look around and then pick up the stick and use it.
【C4】

选项 A、as soon as
B、as long as
C、as far as
D、so long as

答案A

解析
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