题目

在盛放浓硫酸的试剂瓶的标签上应印有下列警示标记的是（）     A．                    B．    C．     D． 答案：考点：  浓硫酸的性质． 专题：  氧族元素． 分析：  根据浓硫酸具有腐蚀性，无毒、不燃烧，在化学与生活中能够使用的化学物质． 解答：  解：A、警示标记为腐蚀性液体的标志，浓硫酸具有腐蚀性，则使用该标志，故A正确； B、警示标记为剧毒标志，而浓硫酸无毒，不能使用该标志，故B错误； You won’t see Justin Bieber for a while. The 25-year-old Canadian singer-songwriter will take a break from music.Bieber started his music career(事业) in 2008. He toured(巡演) hard during his teenage years, as well as his early 20s. He started a family with Hailey Baldwin, an American model, in 2018. Now, he wants to spend more time with his family. “Music is very important to me, but nothing comes before my family and my health(健康),” he said.However, it probably won’t be too long before he comes back.1.You will probably(最有可能) read the article from a/an ________.A. book B. newspaperC. poster(海报) D. instruction book(使用说明书)2.Bieber was just ________ years old when he started his music career.A. ten B. twelve C. fourteen D. eighteen3.According to the article(根据这篇文章), Hailey Baldwin is Bieber’s ________ .A. wife B. friend C. classmate D. boss(老板)4.Bieber thinks that __________ the most important(最重要).A. his family is B. his health isC. his music career is D. his family and his health are5.The writer thinks ________A. Justin will leave his music career forever.B. Justin will come back to his work very soon.C. Justin will not come back to his work very soon.D. nobody can be sure when Justin will be back to his work.