盛极一时的拜占廷帝国最终湮灭于奥斯曼土耳其的扩张之中。拜占廷帝国的灭亡给人留下的深刻启示是(     )

    When 4-year-old British royal family member Prince George started his first day of school in September, Chinese language was on his curriculum（课程）.

    And he wasn't alone. According to a report published by the British Council in September, about 51% of UK parents want their children to learn Chinese, as it's believed to be one of the most useful languages to know.

    In fact, the UK isn't the only country showing a growing interest in Chinese. In the USA, the language has become the second most spoken foreign language this year, after only Spanish, with over 2.million speakers, according to a survey by a US financial news website.

    So far, 67 countries and regions have included Chinese in their national curriculum, reported the China news website.

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⑴简要分析“汉语热”的原因（2-3点）

⑵谈谈作为一名中学生，你应当怎样做才能更好地迎接“汉语热”。

(Ⅰ）求 $f\left(x\right)$ 的最小正周期和最大值;

(Ⅱ)求函数 $y=f\left(-x\right)$ 的单调减区间.