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  3. According to research,there are situatio

According to research,there are situatio

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问题 According to research,there are situations where being more experienced-being more expert,or more knowledgeable-leads to lower performance.Experience can be a（n）1.2 we have been successful,it's easy to feel that we have little left to learn.In one study,researchers asked a group of working adults from a 3 0f industries and jobs in the United States to choose between two hypothetical investment options.Next,researchers gave them a general-knowledge test,which was 4 to prime some of them to feel like experts.This group was given easy questions to answer.Others were given much more 5 questions.Next,all the 6 were told that the fund they'd decided to invest 7 hadn't done well.Researchers asked them 8 they wanted to switch to a different fund or stick 9 the same one.The participants who felt like experts-even though their expertise was 10 a general trivia quiz that had nothing to do with investing-were less 11 to switch gears.They tuned out negative information that clearly 12 they had made a poor decision.The feeling of knowing leads us t0 13 0ur past choices-and the 14 to do so grows stronger the more experience we acquire.We saw this 15 in a real-world situation with high stakes.In 2006,the FDA issued a warning about the dangers of using a common technology,drug-eluting stents,in"off-label"cases.It was surprised to find that the more experience cardiologists had on the job,the more likely they were t0 16 to use drug-eluting stents,.17 the worrisome dangers the FDA had highlighted.The decisions of the experienced cardiologists also influenced their cardiologist coworkers,18.of how long they'd been in the field.The doctors in the sample,19,followed the lead of more experienced cardiologists,not realizing that their experience was 20 what was best for their patients.5选？A.convincingB.challengingC.controversialD.perplexing
选项 A.convincing
B.challenging
C.controversial
D.perplexing
答案 B
解析 本题考查形容词辨析。由空格上句及空格句This group was given easy quesnons to answer.Others were given much more____questions．可知，空格词应与easy相对，表示“困难的，有挑战性”之意，B.challenging符合文意。C.controversial强调问题本身“有争议性、容易引发争论”、D.perplexing强调问题“令人费解的，令人困惑的”，均与casy并非完全相对。
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