题目

炒菜时油锅着火，盖上锅盖灭火的原理是（ ） A．清除可燃物   B．降低着火点 C．隔绝空气 D．温度降到着火点以下 答案：【考点】灭火的原理和方法． 【专题】化学与能源． 【分析】根据灭火的方法分析：灭火的方法有与空气（或氧气）隔绝；降温到可燃物的着火点以下；撤走可燃物． 【解答】解：立即用锅盖盖灭，并没有清除可燃物，也没有降低温度，只是使外界空气不能进入，可燃物缺少了燃烧需要的氧气，所以阅读下面短文，根据所学课文内容填入适当的词语，使文章合理通顺，每空一词。Have you ever wanted to be part of a band as a famous singer or musician? To be 【小题1】       , a lot of people 【小题2】           great importance to becoming rich and famous. Most musicians often meet and 【小题3】           a band because they like to write and play their own music. They may give 【小题4】____________ in pubs or clubs, for 【小题5】_______   they are paid in cash. However, there was one band that started in a different way. It was called the Monkees and began as a TV show. The musicians were to play【小题6】_______  on each other as well as play music, most of which was 【小题7】            loosely on “The Beatles”. And the Monkees’ performances were 【小题8】           enough to be copied by other groups. After a year or so, they started to play and sing their own songs like a real band. Though the band 【小题9】   ____  up in about 1970, they reunited in the mid-1980s. They produced a new record in 1996, with which they 【小题10】          their former time as a real band.The Olympic Games 【小题11】_________ the biggest sports meeting in the world. There are two main sets of Olympic Games -- the Winter and the Summer Olympics. Both of them are held 【小题12】______    four years on a【小题13】            basis. Nowadays all countries can take part. But only athletes【小题14】            have reached the agreed standard for their event will be 【小题15】____________ as competitors. Women are not only allowed to join in the Olympics but play a very important role.