正确答案: C

given

题目：taken

解析：固定搭配keep at anacceptable level表示“保持在一个可接受的水平”。其它三项均不正确。故选C．

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学习资料的答案和解析：

[单选题]The purpose of a custom is to cut down imports in order to protect domestic industry and workers from foreign competition.

tariff

解析：【答案】D【解析】tax“税，税款”；toll“服务费”；fee“费用”；tariff“关税”。

[单选题]________

回答下面的题目：A．that have favorable overtones for the company initiated by the public relations departmentB．not all publicity is initiated by the firmC．usually in the form of press releases or press conferencesD．such as its product quality, the servicing and handling of complaints, and the tenor of the advertisingE. what it means to the company isF. Although the basic purpose of public relations is to provide positive influence on the public image_____

[单选题]The first attempt made by European people to settle downpermanently in North America occurred in the 1580s.

回答下面的题目：The First Settlement in North AmericaIt is very difficult to say just when colonization began. Thefirst hundred years after Christopher Columbus journey of discovery in 1492 didnot produce any settlement on the North America continent but rather someSpanish trading posts further south, a great interest in gold and adventure,and some colorful crimes in which the English had their part. John Cahot,originally from Genoa but a citizen of Venice, was established as a trader inBristol, England, when he made a journey in 1497. But his ship,the Matthew,with its crew of eighteen, did no more than see an island prohably off the NewEngland coast) and return home. He and his son made further voyages across thenorth Atlantic which enabled the English crown to claim a "legal"title to North AmericA．But for a long time afterwards the Europeans interestin America was mainly confined to the Spanish activities further south.The first beginning of permanent settlement in North America werenearly a hundred years after Columbus first voyage. The Englishman Sir WalterRaleigh claimed the whole of North America for England, calling it VirginiA．In1585 he sent a small group of people who landed in Roanoke Island,but theystayed only for a year and then went back to England with another expedition,led by Drake,in 1587. A second group who landed in 1587 had all disappearedwhen a further expedition arrived in 1590.The first permanent settlement in North America was in 1607.English capitalists founded two Virginia companies, a southern one based inLondon and a northern one based in Bristol. It was decided to give the name NewEngland to the northern areA．The first settlers in Virginia were little more thanwage slaves to the company. All were men and the experiment was not verysuccessful. Many dieD．Those who survived lived in miserable conditions. By1619 the colony had only a thousand people.We know for sure that colonization began at the end of the15th century,

Right

[单选题]These are defensive behavior patterns which derive fromour fears.

stem