问题
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It is useful to be able to predict the extent ___
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It is useful to be able to predict the extent ___
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______ that the earth was flat?A.Used it to be thoughtB.Did it used to be thoughtC.Was it
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What does the phrase "go to seed" mean in Paragraph 2?A.Be used.B.Be out of use.C.Develop.
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Helping strangers used to be considered as a virtue. But nowadays people tend to be very c
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Radiocarbon dating techniques can be used to iden