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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TheImportanceofLiteratureI.DefinitionofLiterature—Theword"literature"datesbackto【T1】_【T1】__—Inconnectio

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Besidesconcernsabouthowadsaffectindividuals,criticshaveraisedethicalissuesabouthowadvertisingaffectssociety.F

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

Losingweightiseasierwhenthereismoneyontheline,U.S.researcherssaidonTuesday.Theysaidweight-lossprogramsthat

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专业英语八级

HomeschoolingI.【T1】_____【T1】______—Require【T2】_____【T2】______—Childwhogetseasilyfrustratedisdifficulttobehomeschoo

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

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Besidesconcernsabouthowadsaffectindividuals,criticshaveraisedethicalissuesabouthowadvertisingaffectssociety.F

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

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Congestedcitiesarefastbecomingtesttubesforscientistsstudyingtheimpactoftrafficfumesonthebrain.Asroadwayscho

CollegesandUniversities,institutionsofhighereducationthatofferprogramsbeyondthehighschoollevel.Collegesanduniv

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醛固酮的主要作用是()

患者，男，18岁。因癫痫发作突然跌倒。此时急救的首要步骤是()。

债券的期限在1年以上、10年以下的为（）债券。

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