按课文《聪明的小白兔（二）》内容填空。

       冬天的一个早晨，兔兄弟一块儿在山坡上做游戏。忽然，鸟儿们乱飞起来，对兔兄弟大喊：“不好了，老鹰来了，快藏起来！”

       小灰兔慌了：“这儿没有洞，往哪儿藏啊？”

       小白兔告诉小灰兔：“你藏到乱石堆里！”

       小灰兔忙问：“哥哥，你怎么办呢？”

        “你快藏吧，别管我。”小白兔说完，往湖边的雪地里跑去。

       老鹰飞来了，他在天上瞧了又瞧，什么也没发现。绕了几个圈子，就飞走了。

    When 4-year-old English family member Prince George(乔治王子) started his first day of school in September, Chinese language was on his curriculum(课程表).

    And he wasn't the only one kid. According to a report published by the British Council(英国文化协会) in September, about 51 percent of UK parents want their children to learn Chinese, because it's one of the most useful languages.

    In fact, the popularity of Chinese made the UK government start the Mandarin Excellence Programme in September last year. Its aim(目的) is to make at least 5000 English students speak Chinese well by 2020.

    Yet, the UK isn't the only country showing a growing interest in Chinese. The language becomes the second most spoken foreign language in the USA this year, after only Spanish, with over 2.1 million speakers.

    Many US famous people such as Facebook founder Mark Zuckerberg and Malia Obama, former US President(总统) Barak Obama's daughter, study Chinese as a second language. 

    In April, Arabella and Joseph Kushner, grandchildren of US President Donald Trump, sang the traditional folk music Jasmine in Mandarin for Chinese President Xi Jingping when the two leaders met in Florida.

     So far, 67 countries have studied Chinese in their national curriculum, reported the Chinese website.

Chinese has become more and more____.

下列物质中，不能为人体进行各项生命活动提供能量的是（　　）