英语周报。第五期第五期2022-2022.答案

One possible versionThe Most Beautiful Place in My HeartAs a 17-year-ol teenager, I ve been to many great cities, among which Luoyang is the most beautiful one inlocated on the north bank of the luo river in western Henan pruvinee l aovany is surrounded by mountains on threesidles, high in the west and low in the east. At the end of 2019, Luoyang had a population of more than 7. I millionI love Luoyang so much due to the fact that as one of the four ancient capitals of China, Luoyang has a civilizationhistory of 5, 000 years. Whats more, the number of its heritage sites is second only to Beijing in cities of China. And itfamous tourist attractions inelude Lungmen Grottoes, Baima Temple, Guanlin and so on

10【解题分析】火药爆炸为放热反应,x<0,C(s)的燃烧为放热反应,a<0,A项错误;反应②为K2S的分解反应,为吸热反应,b>0,B项错误;根据盖斯定律,由①×3一②一③可得火药爆炸的反应则x=3a-b-c,C项正确;1molC(s)不完全燃烧放出的热量小于完全燃烧放出的热量,燃烧反应的焓变小于0,则1molC(s)在空气中不完全燃烧生成CO的焓变大于akJ·mol-,D项错误。【答案】C

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