题目

干木材的热值是1.2×107J/kg，要放出3.6×107J的热量，需要完全燃烧多少kg的干木材？ 答案：【答案】3kg【解析】解：干木材的热值，要放出的热量，需要完全燃烧干木材的质量答：干木材的热值是1.2×107J/kg，要放出3.6×107J的热量，需要完全燃烧3kg的干木材。词汇填空（根据首字母或者汉语提示完成句子，共15题，每题1分）【1】The world __________（存在）, whether you like it or not .【2】Fans are curious who will __________（替代）late actor Paul Walker in Fast and Furious 8 .【3】Science magazines recognized the discovery of “ gene for mental illness ” as a great scientific __________（突破）.【4】Organizers say it is __________（标准的）practice to play pre-recorded music at such a large event as the Olympic opening ceremony .【5】Only a few of the many __________（物种）at risk of extinction actually obtain protection like pandas .【6】During Christmas , he , as well as his sister , always __________（志愿）to help serve meals to people who have no homes .【7】Over the next decade , the Internet will have a __________（深刻的）effect on the tourist industry .【8】Even in some smoker-friendly countries like China , smoking is f__________ in public places .【9】I e__________ great difficulties in learning physics , but I didn’t lose heart .【10】 Most of the college graduates prefer to find a p__________ job rather than start their own business .【11】The expression on his face i__________ that he was upset about the result .【12】The d__________ of the rainforest will undoubtedly contribute to global warming .【13】He took all kinds of tests to prove he was q__________ for this important task .【14】Firefighters and police held moment of silence for the v__________ of Tianjin explosion .【15】Personally , to read the o__________ work is better than to see the film based on it .