题目

You can find all kinds information in just 76. __________a few minute on the Internet. It’s like going to a 77. __________huge library without have to walk around to find78. __________your books. Recently even though, many people79. __________have been discussing the dangers of the Internet.80. __________They have been reports in America about people81. __________trying to steal person information for bad purposes.82. __________Finding information on the Net is easily. But not all83. __________information are good to society. For example, you84. __________can find such information like how t如图所示，取三根粗细、长度均相同的光亮细铁丝，将其中两根分别盘成螺旋状，在每根铁丝一端绑上粗铜丝，另一端系一火柴，点燃火柴，待快燃尽时，分别插入充满氧气的集气瓶中（预先放入一些水）。观察到：I、II中铁丝都剧烈燃烧，且II中铁丝燃烧比I中的更剧烈；III中铁丝没有燃烧。 （1）III中铁丝不能燃烧的原因是                      （2）分析II中铁丝燃烧比I中的更剧烈的原因                    。    II中铁丝燃烧的现象是                     （3）铁丝在氧气中燃烧的文字表达式是