2. 考研
  3. Trust is a tricky business. On the one hand, it’ s a necessary condition【C1】______many worthwhile things: child care, friendship

Trust is a tricky business. On the one hand, it’ s a necessary condition【C1】______many worthwhile things: child care, friendship

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问题    Trust is a tricky business. On the one hand, it’ s a necessary condition【C1】______many worthwhile things: child care, friendships, etc. On the other hand, putting your【C2】______in the wrong place often carries a high【C3】______.
   【C4】______, why do we trust at all? Well, because it feels good. 【C5】______people place their trust in an individual or an institution, their brains release oxytocin, a hormone that【C6】______pleasurable feelings and triggers the herding instinct that prompts humans to【C7】______with one another. Scientists have found that exposure【C8】______this hormone puts us in a trusting【C9】______: In a Swiss study, researchers sprayed oxytocin into the noses of half the subjects; those subjects were ready to lend significantly higher amounts of money to strangers than were their【C10】______who inhaled something else.
   【C11】______for us, we also have a sixth sense for dishonesty that may【C12】______us. A Canadian study found that children as young as 14 months can differentiate【C13】______a credible person and a dishonest one. Sixty toddlers were each【C14】______to an adult tester holding a plastic container. The tester would ask, "what’s in here?" before looking into the container, smiling, and exclaiming, "Wow!" Each subject was then invited to look【C15】______. Half of them found a toy, the other half【C16】______the container was empty and realized the tester had【C17】______them.
   Among the children who had not been tricked, the majority were【C18】______to cooperate with the tester in learning a new skill, demonstrating that they trusted his leadership. 【C19】______, only five of the 30 children paired with the "【C20】______" tester participated in a follow-up activity.
【C1】
选项 A、for
B、from
C、like
D、on
答案A
解析 考查介词辨析。本句句意为“一方面，______许多重要的事情来说是一个必要条件”。be necessary for sth．表示“对于某事来说是必要的”。其余三个介词都不可以与necessary连用。
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