7.C【解析】高锰酸钾与浓盐酸可制取氯气,氯气有毒,不能作为室内消毒剂,A错误;消毒液不能直接作用于人体上,会对人造成伤害,B错误;消毒液并非浓度越高越好,过高浓度的消毒液既不能达到有效的消毒效果,又会造成环境污染,所以消毒液要稀释后使用,C正确;医用酒精的质量分数为75%,D错误。

第四部分写作Sample writings第一节ear susan,o. How s everything going? There's a live concert this Saturday evening at Xinhua Concert Hall.uldith me?The concert is about Chinese folk music, and the players are the top musicians in China. Fora Chinesc learner, you will surely be interested in it. The concert is from 7 pm to 10 pm. Ivc gottwo tickets from my mother Shall we mect at 6 30 pm at the entrance gate of the hallLooking forward to your early reply.YoursLi Hua

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