(二)完型填空(本大题共10小题，每小题1分，共10分)
从选择项中选择一个最适合短文的选项。答案标在答题纸上。
Human beings act in a different way from that of animals just because they can speak while animals cannot.___21___ the cleverest animals cannot do things which to us seem very ___22___ and which small children, as soon as they learn to talk, would be able to do.
A German scientist, who performed experiments for many years with big apes, found that his apes could ___23___ his sticks as stools to pull down bananas which they could not reach. But they only used the stick to get a banana when both the banana and the stick were ___24___ 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 ___25___ enough in mind to look around and then pick up the stick and use it.
The ___26___ for this is clear. We have words for banana and stick which help us to think about these things when they are not in ___27___.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 ___28___ behind and use it on the banana.
Unable to speak, animals cannot keep their knowledge of things ___29___ long. That’s why they often interrupt one line of action to do something else and later forget it completely. Human beings, on the other hand, use ___30___ and are able to do one thing continuously.
21.A.If B. Even C. Though D. When
22.A.honest B. foolish C. simple D. evident
23.A.take B. hold C. regard D. use
24.A.in B. beyond C. for D. with
25.A.close B. alive C. long D. complete
26.A.reason B. answer C. truth D. thought
27.A.mind B. thought C. sight D. brain
28.A.in B. at C. around D. from
29.A.before B. for C. after D. since
30.A.knowledge B. language C. mind D. memory
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