2. 考研
  3. Trust is a tricky business. On the one hand, it’s a necessary condition【B1】______many worthwhile things; child care, friendships

Trust is a tricky business. On the one hand, it’s a necessary condition【B1】______many worthwhile things; child care, friendships

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问题     Trust is a tricky business. On the one hand, it’s a necessary condition【B1】______many worthwhile things; child care, friendships, etc. On the other hand, putting your【B2】______in the wrong place often carries a high【B3】______.
    【B4】______, why do we trust at all? Well, because it feels good. 【B5】______people place their trust in an individual or an institution, their brains release oxytocin, a hormone that【B6】______pleasurable feelings and triggers the herding instinct that prompts humans to【B7】______with one another. Scientists have found that exposure【B8】______this hormone puts us in a trusting【B9】______: In a Swiss study, researchers sprayed oxytocin into the noses of half the subjects; those subjects were ready to lend significantly higher a-mounts of money to strangers than were their【B10】______who inhaled something else.
    【B11】______for us, we also have a sixth sense for dishonesty that may【B12】______us. A Canadian study found that children as young as 14 months can differentiate【B13】______a credible person and a dishonest one. Sixty toddlers were each【B14】______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 【B15】______Half of them found a toy; the other half【B16】______the container was empty and realized the tester had【B17】______ them.
    Among the children who had not been tricked, the majority were【B18】______to cooperate with the tester in learning a new skill, demonstrating that they trusted his leadership.【B19】______, only five of the 30 children paired with the "【B20】______"  tester participated in a follow-up activity.   
【B1】
选项 A、on
B、like
C、for
D、from
答案C
解析 考查介词辨析。第一段首句指出信任是一个矛盾体，接下来分述这一矛盾体的两种表现。本题所在句对应其第一种表现，冒争后的child care和friendships等是对worth while things的举例说明。根据句意，信任是众多值得做的事情的必要条件，例如儿童保育、友谊等。condition表“先决条件”时，后面跟介词for或of，故选C。
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