Where is your ball?____

 y=cosx经过伸缩变换$\left\{\begin{array}{c}{x}^{\text{'}}=2x\\ y^{\text{'}}=3y\end{array}\right.$  后,曲线方程变为(   )

    Mr Brown lives in a nice house in a small town with his wife(妻子), Mrs Brown. From Monday to Friday he works in an office near his house. He is free on Saturdays and Sundays. He has a nice garden beside his house. He likes growing flowers and he often works in the garden on Saturdays and Sundays. The flowers are very beautiful and Mrs Brown likes them very much. She often helps Mr Brown.

有人说：“用‘分’来计算时间的人，比用‘时’来计算时间的人，时间多出59倍。”这句话告诉我们（     ）