Which of the following is TRUE according to the passage?

Which of the following is TRUE according to the passage? A.Young people in Europ

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已知|a|=1,|b|=6,a·(b-a)=2,则向量a与b的夹角是(  ).

已知|a|=1,|b|=6,a·(b-a)=2,则向量a与b的夹角是(  ).A. B. C. D.

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回答题Text 3We feel it is important to start reading to your ch

回答题Text 3We feel it is important to start reading to your child right from the

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