题目

 下列说法正确的是（     ） A. 某有机物燃烧只生成CO2和H2O，且二者物质的量相等，则此有机物的组成为CnH2n B. 相同物质的量的烃，完全燃烧，生成的CO2越多，说明烃中的W（C）越大 C. 某气态烃CxHy与足量O2恰好完全反应，如果反应前后气体体积不变（温度＞100℃），则y＝4；若体积减少，则y＞4；否则y＜4 D. 相同质量的烃，完全燃烧，消耗O2越多，烃中含W（H）越高阅读下文并回答问题。I went hiking to a mountain with my friends last summer． It was a good trip at the beginning but something unexpected happened on the half way．One of my friends, Mike, suddenly felt a terrible pain in his stomach and he couldn’t move any further． Nobody knew what to do． One girl tried to call her mum with her mobile phone but there was no signal in the mountain area． Luckily I brought medicine with me． After Mike took some, he felt much better． We walked on, and then we all enjoyed ourselves on the top of the mountain.1.Did the writer go hiking with friends last spring?_____________________________________________________________________2.Was the trip good at the beginning?_____________________________________________________________________3.What’s wrong with Mike on the half way of the trip?_____________________________________________________________________4.How did Mike feel after taking some medicine?_____________________________________________________________________