单选题：根据以下材料，回答题Trust is a tricky business.On the one hand, it's a

根据以下材料，回答题
Trust is a tricky business.On the one hand, it's a necessary condition 1 many worth while 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 oxytoc in, a hormone that 6 pleasurable feelings and triggers the herding instinct that prompts humans to 7 with one another. Scientists have found that exposure8 this hormone puts us in a masting 9 : Ina 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 13 a 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 17 them.
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.activity.
第1题答案是 A．on
A．on
B．like
B．like
C．for
C．for
D．from
D．from