在人类的遗传性状中，舌卷曲是显性（R），舌不卷曲是隐性（r）。请问，一对舌不卷曲的夫妇能生育出舌卷曲的子女吗？为什么？

某校为了研究学生的性别和对待某一活动的态度（支持和不支持两种态度）的关系，运用2×2列联表进行独立性检验，经计算K²＝7.069，则最高有____（填百分数）的把握认为“学生性别与是否支持该活动有关系”.

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    Every Sunday Mr and Mrs Hu spend their day in the countryside.Mr Hu enjoys taking pictures1trees and flowers.Mrs Hu2walking along the riverside.Last Sunday,it was wet and windy.They3go out.

  They watched two DVDs at home.Next Sunday they are going to4to Tokyo.They are going to shop there.They5very excited about the trip.