题目:
假如你是某中学高二学生李华。请你根据以下图片,用英语写一封信给某中学生英文报,谈谈自己对边做事、边听音乐的看法。
注意:
1.要写出自己的看法(赞成或不赞成)、理由和结论;
2.短文开头和结尾已给出,不计入总词数;
3.词数:120左右。
Dear editor,
I'm a student of Senior Two of a middle school.I'd like to express my opinion about a kind of common behavior I have noticed.It seems that many students enjoy listening to MP3 players while doing other things.
Your sincerely,
Li Hua
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:pH为5的硫酸溶液中氢离子浓度是10-5mol/L,则c (SO)=5×10-6mol/L,所以稀释500倍后,c (SO)=1×10-8mol/L。但硫酸无论怎么稀释,氢离子浓度不能小于10-7mol/L,只能是接近10-7mol/L,...