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单选题
Trust is a tricky business.On the one hand, it's a necessary condition 1 many worthwhile things: child care, friendships, etc.On the other hand, putting your 2 in the wrong place often carries a high 3 .
4 , why do we trust at all? Well, because it feels good.5 people place their trust in an individual or an institution, their brains release oxytocin, a hormone that 6 pleasurable feelings and triggers the herding instinct that prompts humans to 7 with one another. Scientists have found that exposure 8 this hormone puts us in a trusting9 : 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 10 who inhaled something else.
11 for us, we also have a sixth sense for dishonesty that may12 us.A Canadian study found that children as young as 14 months can differentiate 13a credible person and a dishonest one.Sixty toddlers were each 14 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 15 .Half of them found a toy; the other half 16 the container was empty and— realized the tester had 17them.
Among the children who had not been tricked, the majority were 18 to cooperate with the tester in learning a new skill, demonstrating that they trusted his
leadership.19 , only five of the 30 children paired with the " 20 " tester participated in a follow-up activity.
第1题答案是______.
A
B
C
D
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答案：
解析：
本题考查介词辨析。根据语境和句子结构，此处需要填入一个介词来连接“信任”和“许多有价值的事情”，表示信任是这些事情的“必要条件”。选项C的介词“for”表示“对于……来说”，符合句意，因此是正确答案。其他选项不符合语境或语法要求。
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