根据意思写诗句。

①和我久久地凝视着而互相看不够的，只有敬亭山了。

②江南春天的美景实在太美了，这的美丽风景，曾经是多么熟悉，多么了解。

（1）加入HNO₃酸化的Ba（NO₃）₂溶液→白色沉淀→判断一定有SO₄^2﹣，是否正确 ____，理由是 ____　．

（2）加入HCl酸化的BaCl₂溶液→白色沉淀→判断一定有SO₄^2﹣，是否正确 ____理由 ____

（3）加入Ba（NO₃）₂溶液→白色沉淀→再加HCl→沉淀不溶解→判断一定有SO₄^2﹣，是否正确　 ____理由 ____　．

若以上操作都不正确，则正确的操作是：先加入 ____→现象 ____→再加入 ____→现象 ____→判断一定有SO₄^2﹣．

文言文阅读 ，回答相关问题。
        二世元年七月，发闾左適戍渔阳，九百人屯大泽乡。陈胜、吴广皆次当行，为屯长。会天大雨，道不通，度已失期。失期，法皆斩。陈胜、吴广乃谋曰：“今亡亦死，举大计亦死，等死，死国可乎？”陈胜曰：“天下苦秦久矣。吾闻二世少子也，不当立，当立者乃公子扶苏。扶苏以数谏故，上使外将兵。今或闻无罪，二世杀之。百姓多闻其贤，未知其死也。项燕为楚将，数有功，爱士卒，楚人怜之。或以为死，或以为亡。今诚以吾众诈自称公子扶苏、项燕，为天下唱，宜多应者。”吴广以为然。乃行卜。卜者知其指意，曰：“足下事皆成，有功。然足下卜之鬼乎！”陈胜、吴广喜，念鬼，曰：“此教我先威众耳。”乃丹书帛曰“陈胜王”，置人所罾鱼腹中。卒买鱼烹食，得鱼腹中书，固以怪之矣。又间令吴广之次所旁丛祠中，夜篝火，狐鸣呼曰“大楚兴，陈胜王”。卒皆夜惊恐。旦日，卒中往往语，皆指目陈胜。

用所给单词的适当形式填空，未提供单词的根据上下文填入适当的词。

    English teachers may not teach the debate (辩论) ____ they think it is too difficult for their students. But the debate can be a powerful tool. It can help students learn to speak naturally and to listen ____ (careful). Professor Charles Lebeau ____ (teach) English and debate in Japan. He wrote a book ____ (call) “Discover Debate”. The book helps English learners understand how ____ (carry) on a simple debate. When teaching the debate to English ____ (learner), Mr. Lebeau begins with “controlled practice”. Students work in pairs to practise ____ (say) opinions and giving reasons in short conversations. They learn to identify opinions about everyday topics, such as sports stars, food, weather and habits. In the next stage, students tell their argument (论据) They have to do some talking, ____ not too much. The ____ (three) stage is answering the other team's argument. Here, debaters need a higher level of language ability. In ____ word, debating gives students a better understanding of Western culture and lets students practise their thought.