GRE

简答题Emily Post．who diedfifty years ago，was probably the best-known____________on American manners and etiquette；her booksare still in use today．

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B．C
Again，more than two choices fit the context，but only choices B and C are synonyms.

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1根据以下内容回答题
In 2007．Mether Iones published anarticle on “theethanol effect，”showing tlle negativeramifications of switching from foreign oil to corn—based ethanol．It
pointedout that over lust five years，tlle amount of corn used for ethanol had
Linerisenfrom 7 percent to 20 percent．That led to a rise in the price of corn，which(5)inturn led to a rise in food prices．Since so much cornwas used to manufacture ethanol，less was exported．This meant less corn on the global market and the potential of anincrease in global hunger．Ironically，the production of corn requires a great deal of gasoline fortractors and harvesters，reducing the energy savings tobelow that of gasoline．
Consider each of the choicesseparately and select all that apply．
According to the passage，what are some negatives involved in switchingfrom foreign oil toethanol?

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2Select one answer choice．
In the final sentence，the author suggests that_________

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3You’re more likely to see atavern or restaurant named the Whistle Post than tonotice the little signsalong the tracks marked with a W or an X The whistle-post signs tell trainengineers where to begin blowing a warning prior to crossing Li ne anintersection．Theyare especially useful where the railroad crossing has no(5) automaticbarrier--on rarely traveled crossings or when approaching rail yards，for example．Train whistles have largely beenreplaced by air horns，but the rules of rail travelstill call for two short，one long，and one short blast of the horn to be repeated until the trainreaches the crossing．The noise may be a nuisance，but studies have shown that accidents double when the horn is notused．
Consider each of the choicesseparately and select all that apply．
Based on the information in the passage，which of these can be inferred about whistle posts?

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