下列函数中，在区间$\left(0+\infty \right)$不是增函数的是（        ）

根据短文理解，选择正确答案。

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Saturday: 10:00 am – 5:00 pm

Sunday: 11:00 am – 5:00 pm

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The Skyliner Restaurant

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Sunday: 11:30 am – 5:00 pm

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The aged and students with ID: $6.00

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