In 1490 or so, the main progress mentioned in this passage was. An invention of an Italian professor.

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问题 In 1490 or so, the main progress mentioned in this passage was______.
An invention of an Italian professor______.

选项 A、gave later inventors the idea of moving air around in diving devices.
B、can "clean" the air.
C、was used to remove moisture.
D、was nothing but a plan.

答案D

解析

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本试题收录于：公共英语五级笔试题库公共英语（PETS）分类

公共英语五级笔试

公共英语（PETS）

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In 1490 or so, the main progress mentioned in this passage was______. An invention of an Italian professor______.

公共英语五级笔试

公共英语（PETS）

MakingYourselfaGoodRecordIfyouareanAmericanandyouthinkyoumightneedtoborrowmoneysomeday,thebestthingto

TheDangersofSecondhandSmokeMostpeopleknowthatcigarettesmokingisharmfultotheirhealth.Scientificresearchshow

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Whichofthefollowingreasonsdoesnotexplainthefactthat"knittingwasnolongeraskillworthpassingdownfrommotherto

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In 1490 or so, the main progress mentioned in this passage was. An invention of an Italian professor.

转子的弯曲主要是在加工过程中造成的。(　　　　　)