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.
【C20】

选项 A、look
B、rest
C、try
D、taste

答案A

解析 由前文中“所有的渡鸦都能够追随实验者的目光,有些好奇的渡鸦甚至能越过障碍物”以及后文中“跳上障碍物,并从上面俯视”可知,渡鸦跳下木杆或走到障碍物周围是为了看到实验者的目光所指向的方向,have a look意思为“看一眼”,故选A。
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