Research completed in 198found that in the United States soil erosion

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问题 Research completed in 198found that in the United States soil erosion

选项 A、reduced the productivity of farmland by 20 per cent.
B、was almost as severe as in India and China.
C、was causing significant damage to 20 per cent of farmland.
D、could be reduced by converting cultivated land to meadow or forest.

答案C // was causing significant damage to 20 per cent of farmland

解析

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Research completed in 198found that in the United States soil erosion

雅思阅读

雅思（IELTS）

Thefigurebelowshowstwoconcentriccircles,eachwithcenterO.Giventhatthelargercirclehasradius12andthesmallerci

Inaboxof10electricalparts,2aredefective.(a)Ifyouchooseonepartatrandomfromthebox,whatistheprobabilitythat

15is60%ofwhatnumber?

Thereare10studentsinaclassroom.Ifeachstudentshakeshandswithexactly3otherstudents,whatisthetotalnumberofha

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A、Thesecondparagraphreliesondifferentevidenceindrawingaconclusionsimilartothatexpressedinthefirstparagraph.B、

A、AnassumptionbasedonevidencealreadypresentedB、Aconcessiontotheviewopposingthatoftheauthor’sC、Ahypothesisconc

Whentheevidenceis______,wecanbemoreconfidentofthehistoricalscenarioswepropose;whentheoriesareweakorevidence

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