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三题外语请给出依据1theplantplutoonlythiscenturyA.wasdiscoveredB.discoveredC.hasdiscoveredD.itwasdiscovered2thewindchillfactorwhichgivesthebestideaofhowapersonwillfeeloutsideonacolddayA.isB.itisC

题目详情
三题外语 请给出依据
1 the plant pluto _____only this century
A.was discovered B.discovered C.has discovered D.it was discovered
2 _____the windchill factor which gives the best idea of how a person will feel outside on a cold day
A.is B.it is C.there is D.becasue
3 Economics____the science of choise.
A.are B.which is C.is D.and
▼优质解答
答案和解析
1A
被动语态
2B
强调句句型
3C
作为学科用单数