题目：
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have to study very hard. Others have trouble 2 on well with people like their parents and classmates. Jiu, a second-year junior student 3 Fujian, could not understand his teacher and was doing 4 in class. He became so worried about it 5 he started to cut his fingers (手指) with a knife. Another student, 14-year-old，from Guangzhou, was 6 of exams. She got very worried, and 7 she looked at the exam paper, she couldn’t think of anything to write. Many students won’t ask for help. Some think they will look stupid if they go to see a 88 . Others don't want to talk about their secrets. An expert on teenagers has the following 9 for teens: 10 to your parents or teachers often. Take part in group activities and play sports. Go to see a doctor if you feel unhappy or unwell. |
答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：要选择测定空气中氧气的可燃物，需满足这样几个条件：1、能在空气中燃烧，且只能与氧气反应，2、燃烧时不能生成其它的气体，A、铁丝不能在空气中燃烧，错误，B、正确，C、镁不仅会与氧气反应，...
