问题描述：
Who is the tallest?
Jack is as tall as John.John is not as tall as Bob.But Ken is taller than Bob.Who is the tallest of the four?
A.Jack B.John C.Bob D.Ken
Jack is as tall as John.John is not as tall as Bob.But Ken is taller than Bob.Who is the tallest of the four?
A.Jack B.John C.Bob D.Ken
问题解答：
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