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.

专业英语八级

Canadaistheworld’s______withthelandareaofabout10millionsquarekilometers.

______isrememberedasagreatgeneral,asoneofthefoundersoftheRepublic,asthecountry’sfirstPresidentandalsoas"t

Englishlocalgovernmentexpenditureaccountsforabout______ofpublicspending.

Ihaveaplanthatwillraisewages,lowerprices,increasethenation’sstockofscientistsandengineers,andmaybeevencreat

RecyclingTheconceptofgreenconsumerismhasgainedmomentumoverthelastdecade,andthepublichasbeeninfluencedand

TheofficiallanguagesofNewZealandincludeallthefollowingEXCEPT______.

Why"time-out"isNOTsuggestedasameanstostopchildrenfromdoingsomething?

Theindustrialagehasbeentheonlyperiodofhumanhistorywhich1.______mostpeople’sworkhastakentheformofjobs.Thei

______,thesecondlargestcityinIreland,isknownas"theRebelCounty".

YouarcgoingtograduatefromUniversity,andduringtheresttimeyouaremoreconcernedwithyouroccupation.What’syourpla

漏出性出血可见

Mr.SmithreturnedfromChinalastweek,takinga(n)___________vase.

对于透视及摄影的说法，下列说法正确的是

目前HPV感染的检测方法不包括

男，26岁，左胸锐器伤后1小时，血压90／60mmHg，心率90次／分。X线胸片示左肺压缩90％，伴宽大液平。清创缝合后行胸腔闭式引流，2小时引流约700ml血液，血压80／50mmHg，心率110次／分，伤后无尿。此时最关键的处理措施是

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