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

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. Bernd Heinrich and Thomas Bugn-yar 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 10 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.
【C6】
选项 A、on
B、to
C、against
D、for
答案A
解析 该题考查介词的用法。on在…上；关于；to向…方向；against相反；for为了。根据句意可知，此处意为对渡鸦进行的一项实验，其中“ravens”是实验对象，前面需要一个表示“关于”的介词，on符合文意，故选A。
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