On a ____tour in Britain, Freddy and the band were very popular. Fans showed much ____ to them. Freddy was very ____in the hall. After his most exciting____to perform on a TV program, things ____ wrong____they went, they were always ____ Finally, feeling____and ____, they realized that they must leave, or it might become too ____ for them. So they left Britain.

低俗、过度的休闲活动，不仅不利于消除疲劳、缓解压力，还会使人染上一些不良习气，甚至走上违法犯罪的道路。这说明（    ）

下图是我国为纪念巴黎公社成立100周年发行的一套邮票。下面有四条发行这套纪念邮票的理由，你认为哪个理由最佳(     )

结合如图所示装置回答问题：

反思 ①：该实验中红磷过量，你认为是否有道理？____(填“是”或“否”)，你的理由是____。

写出红磷燃烧的符号表达式____。

反思②：在动手实验的过程中，你认为该实验的不足是：____(至少一条)。