Mr. Li worked in a post office in Weihai. Last month he retired. His son works in America. Five years ago Mrs. Li went to America to look after their grandson. So Mr. Li decided to see them.
   Mr. Li was afraid of taking the plane so he decided to go to America by ship. On the first morning on the ship, Mr. Li met an American. The man said to him, “Good morning!” Mr. Li thought the man told him his name. So he said to him, “Li Haitao.”
   On the second morning, Mr. Li met his son’s friend on the ship. He told him about the American. After hearing that, his son’s friend laughed and said, “He said hello to you in the morning.”
   On the third morning when Mr. Li met the American again, he said, “Good morning!” And the American said to him, “Li Haitao, sir.”

联系材料，运用所学知识回答：如何评价***对社会主义制度下价值规律作用的认识？

植物地上部分向光生长，根背光生长。取正在萌发的种子贴附在琼脂板上，再将琼脂板插入透明盒内培育，五面遮光，仅从一侧给予光照（见右图）。幼苗根的生长方向将是（  ）

呼吸道不仅能保证气体顺畅通过，还能使到达肺部的气体温暖、湿润、清洁（判断对错）

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在卢沟桥作战中，二十九军组织大刀突击队夺桥，战士们抡起大刀，冲入敌阵，展开激烈的肉搏战，几乎全部战死桥头，烈士的鲜血染红了卢沟桥。音乐家麦新为此作《大刀进行曲》，“……大刀向鬼子们的头上砍去!全国爱国的同胞们，抗战的一天来到了，前面有抗战的正规军，后面有支前的老百姓，我们万众一心共同前进。冲向那敌人，把它消灭!冲啊──大刀向鬼子们的头上砍去!”这首歌成为流传甚广的抗战歌曲。

（1）《大刀进行曲》中的“鬼子们”指的是什么人？

（2）大刀突击队的英勇事迹及《大刀进行曲》体现了怎样的民族精神？

（3）这首歌成为流传甚广的抗战歌曲，在当时起了什么作用？“