2. 外语
  3. Humans like to regard themselves as exceptional. Many philosophers believe humans are the only【C1】________which understands that

Humans like to regard themselves as exceptional. Many philosophers believe humans are the only【C1】________which understands that

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问题     Humans like to regard themselves as exceptional. Many philosophers believe humans are the only【C1】________which understands that others have their own personal thoughts. That understanding is known in the【C2】________as having a "theory of mind, "and it is considered the【C3】________to such cherished human【C4】________as sympathy and deception.
    Biologists have learned to treat such【C5】________with caution. Bernd Heinrich and Thomas Bugnyar describe an experiment they have carried out【C6】________ravens.
    【C7】________to gaze is reckoned to be a good【C8】________of the development of theory of mind in human children. 【C9】________  about 18 months, most children are able to follow the gaze of another person, and【C10】________things about the gazer from it. Failure to     【C11】________this trick is an early symptom of autism, a syndrome whose main underlying feature is a(n) 【C12】________to understand that other people have【C13】________, too.
    To【C14】________whether ravens could follow gaze, Dr Heinrich used six six-month-old hand-reared ravens. The birds were set, one at a time, on a perch on one side of a room divided by a barrier. An experimenter in front of the barrier【C15】________his head and eyes in a particular【C16】________and gazed for 30 seconds before looking【C17】________ Dr Heinrich found that all the birds were able to follow the gaze of the experimenters, even【C18】________the barrier. In the 【C19】________case, the curious birds either jumped down from the perch and walked around the barrier to have a【C20】________or leapt on top of it and peered over.
【C18】
选项 A、into
B、within
C、beyond
D、from
答案C
解析 由前文“实验者发现全部渡鸦都能追随实验者的目光，甚至能够……”以及后文的“障碍物”可知，此处所表达的意思是渡鸦甚至能够越过障碍物而追踪实验者的目光。beyond the barrier表示越过障碍物，符合文意，故选C。
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