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听力原文：When asked how to spend the Christmas vacation, Tom and his wife said they were going to Sydney and New York respectively. (27)A.
Both Tom and his wife will go to Sydney and New Work at Christmas.
B.
Tom will go to New York while his wife Sydney.
C.
During the Christmas holiday, Tom will go to Sydney and his wife will go to New York.
D.
To show respect to his wife, Tom will go to New York together with her.
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【简答题】向量 a =（cos23°，cos67°）， b =（cos68°，cos22°）， u = a +t b （t∈R）． （1）求 a ? b ； （2）求 u 的模的最小值．
【简答题】（文科）设向量 a =（cos23°，cos67°）， b =（cos68°，cos22°）， u = a +t b （t∈R），则| u |的最小值是______．