A small town named Bundanoon in Australia has decided to stop the sale of bottled water(瓶装水). They say that bottled water can cause environmental problems. Too many resources(资源) are used to make bottled water. When people finish drinking the water, the bottles will be thrown away and go into dustbins. So they require local people in the town to stop buying bottled water and use tap water to drink. Visitors are encouraged to get water from water stations in the main streets, and fill the water in bottles that can be used again. The decision has been supported(支持) by all the shopkeepers in the town. Bundanoon is the world’s first town that has got its shop selling bottled water. Probably we should follow the example. Let’s stop buying bottled water and use tap water！

铁丝在空气中不能燃烧，因为氧气在空气中的体积分数约为____，而铁丝在氧气中燃烧的现象却是____ ；实验时，瓶中预先留少量水或沙是为了____，待火柴棒快燃尽时才将铁丝伸入瓶内是为了____ 。

公民在现实生活中经常遇到一些问题，需要对政府和有关部门发表自己的意见和建议，公民可以行使监督权。公民通过多种方式行使监督权（    ）

①就是对政府提意见

②必须采取合法的方式

③可以表达自己所有的诉求

④坚持实事求是的原则

下列各句没有语病的一句是（    ）