6.B由题知四种元素为H、C、O、S,非金属性:O>C,所以气态氢化物的稳定性:H2O>CH4,A错误;H2O2水溶液因为强氧化性可杀菌消毒,且还原产物是H2O适用于医用伤口消毒,B正确;同一周期,从左到右,原子半径减小故原子半径顺序:C>O,C错误;常温常压下,碳的单质与CO2不反应,高温下才反应,D错误。

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

以上就是2018-2022英语周报七年级新目标第49答案，更多英语周报答案请关注本网站。

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