单选题在四个烧杯中分别盛有稀硫酸，各滴加几滴石蕊试液，然后向这四个烧杯中分别加

单选题 在四个烧杯中分别盛有稀硫酸，各滴加几滴石蕊试液，然后向这四个烧杯中分别加入下列物质，其中能使溶液呈紫色的是（）A.氢氧化钠B.硫酸C.硫酸钠D.硫酸钡

A

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(答案→)Dear teacher,As your student, I would like to give you some suggestions on behalf of all my classmates。First ，I want to say I love you。And I want to tell you that the smile on your face in English class gives us confidence。Then ，we think we will love you more of you make your lessons more lively and more interesting 。Also，we think that we are all excellent and hope to be more often praised by you。What's more ，we'd like you to give us some reasonable suggestions instead of orders。Finally，as you are always working very hard ，it is quite important for you to learn to have a rest and take care of yourself。Best wishes to you。Yours ，Lihua 解析：可联系答.案.网客服索取。

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