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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The prediction of the test is likely to be mistaken due to______.A.the irrelevance of the
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The fact that a being is going to die does not______us to use it as a natural resource for
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He came to know that the knowledge from books can be useful only _____it is linked with pr