How Native Americans developed corn is a puzzling, for no wild com has ever been discovered.

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问题 How Native Americans developed corn is a puzzling, for no wild com has ever been discovered.

选项

答案puzzling—puzzle

解析译文：土著美国人如何种植玉米是个谜，因为至今还没有发现野生的玉米。
分析：考查词性。冠词a后应该加可数名词单数，puzzling是形容词，应改为名词puzzle。

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专业英语八级

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How Native Americans developed corn is a puzzling, for no wild com has ever been discovered.

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HowtoSolveResearchProblems?I.【T1】______【T1】______—Problem:hardtodeviseathesisortopic—Solutiona)Digestyournot

TheImportanceofLiteratureI.DefinitionofLiterature—Theword"literature"datesbackto【T1】_____【T1】______—Inconnectio

ShouldYouLearnThai?HereareeightfeaturesaboutThailanguagetohelpstudentsdecidewhethertheywanttolearnThaiorno

CrossCulturalNegotiationsIt’simportanttounderstandtheculturaldifferencesinnegotiations,asdifferentcultureshavedi

Fordecades,thetelevisionwastheflagshipofanyconsumer-electronicsproductline-up.Inallthegadgetsinthehome,【M1】___

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Perspiration,thebody’sbuilt-incoolingmechanismoccursasanaturalreactiontonervousness,intenseheat,orvigorouslyexe

Thesechannelsoriginattopographichighpoints;thevalleyswiden"downstream",someevendisplayinginnervalleys.

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Alikelightwaves,microwavesmaybereflectedandconcentrated.

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