①使澄清石灰水变浑浊

②使湿润的蓝色石蕊试纸变红

③使品红溶液褪色

④通入足量NaOH溶液中，再滴加BaC1₂溶液，有白色沉淀生成，该沉淀溶于稀盐酸．

“引大济湟”是从湟水最大支流大通河引水，穿越山脉进入湟水流域的调水工程。该工程将在2015年第四季度全线通水，届时将有效缓解湟水干流地区当前的“水荒”问题。下图示意“引大济湟”工程线路。据此完成各题。大通河成为“引大济湟”水源地，主要是因为该河（      ）

①年径流量较大           ②流域降雨丰富

③北高南低可自流引水     ④流域水资源需求量小

阅读短文并选择方框内的适当形式填空，每空仅填一个词，每个词仅用一次。

    CCTV New Year's Gala(春晚) is a Chinese New Year special produced by China Central Television. The program begins at 8:00 PM and ____  until about 1:00 AM on the first day of the New Year.
    The program has received extremely ____  audiences(观众), which have grown greatly  ____ the years. As the Chinese New Year’s Eve is a time when the____ members get together, the Gala adds a pleasant mood to the house ____  people sis in front of their TV set laughing, discussing and enjoying the ____ . It has become a ____ in China to watch the New Year’s Gala. Around 1:00 in the early morning, the program ____ with the song Can't Forget Tonight.
    To bring audiences even ____  to the yearly show, the Gala organizers have tired many ways to make the program more attractive. It is ____  that there will be no advertisements this year so that audiences can be satisfied with a natural and smooth Gala.

根据要求完成下列各题。

       “礼”是中华传统文化的重要内容，知书达礼是学校的育人目标之一。学校在打造“礼仪校园”的过程中，准备开展以“学礼•明礼•守礼”为主题的综合性学习活动。