题目

It’s the time of year when graduates are looking forward to putting constant exams behind and moving on to a more exciting stage of their lives. But in the digital age, not everything is so easily left behind, because they have created a digital footprint that’s often not easy to cover up. However, there are various actions they can take to make that online presence more appearing 36 Clean up your Facebook account Clean up your Facebook page and get rid of anything that could be considered offensive or held against you. Remember, the test is no longer “Would you want grandma to 阅读下列科普短文，然后回答问题．臭氧在通常状况下是淡蓝色、有鱼腥臭味的气体．臭氧不稳定，一旦受热极易转化成氧气，并放出大量的热，臭氧的氧化能力比氧气强得多．臭氧在地面附近的大气层中含量极少，在离地面25km处有一个厚度极薄的臭氧层．臭氧层能吸收太阳辐射中的大量紫外线，使地球上的生物免遭紫外线的伤害．它是一切生命的保护层．但长期吸入大量臭氧会引起口干舌燥、咳嗽等不适症状，还可能引发中毒性肺气肿．超音速飞机排出的废气中的一氧化碳、一氧化氮等气体、家用电冰箱中使用的制冷剂“氟里昂”等对臭氧层有很大的破坏作用，会使臭氧层形成空洞，从而使更多的紫外线照射到地球表面，导致皮肤癌的发病率大大增加，如不采取措施，后果不堪设想．（1）将带火星的木条伸入到盛有臭氧的集气瓶中，可以看到    的现象．（2）氧气转变成臭氧的过程发生    变化（填“物理”或“化学”）．（3）应采取     的方法保护臭氧层．（4）磷在臭氧中燃烧与在氧气中燃烧相似，请写出磷在臭氧中燃烧的文字表达式    ；（5）从上述材料中可知臭氧的作用有利有弊．请再举出一种物质，并说出其利弊    ．