问题
单项选择题
参照国际危规对自燃物质包装类别的判定标准，可将自燃物质划分为（）个危险级别。
A、2
B、3
C、4
D、5
答案
参考答案：B
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参照国际危规对自燃物质包装类别的判定标准，可将自燃物质划分为（）个危险级别。
A、2
B、3
C、4
D、5
参考答案：B
Everyone 1 tired sometimes. When you are tired, You should follow the doctor’s advice. First, you should go to bed early 2 a few nights. You shouldn’t 3 at night or study 4 . Having a good rest 5 good for your health. Second, you should 6 every day. Third, you should eat fruit and other 7 ,and it’s important 8 a balanced diet .Don’t 9 stressed out , or it makes you sick. You should 10 some music . You shouldn’t study when you are tired . If you take the advice above , you’ll be a healthy person.
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