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

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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. Bemd Heinrich and Thomas Bugnyar describe an experiment they have carded 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.
【C5】

选项 A、comparisons
B、findings
C、assertions
D、studies

答案C

解析 该题考查名词词义辨析。comparisons比较;findings发现;assertions断言,论断;studies研究。根据前文可知,第一段主要列举了哲学家的观点来进一步论证“人类喜欢把自己当作例外”这一论点,然而文中并未明确说明哲学家的观点是得到实证证明的,言外之意是,这只是他们的主观看法,由此可推知,此处表达的意思是生物学家对哲学家的“断言”提出的质疑,故选C。
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